UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                 SCHEDULE 13G
(Rule 13D-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-(b)(c), AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)
                                
UNDER THE SECURITIES EXCHANGE ACT OF 1934

             
                         

PETROKAZAKHSTAN INC.
Name of Issuer)


COMMON SHARES
                         (Title of Class of Securities)


                                   44779E106
                                 (CUSIP Number)


May 13, 2005
________________________________________________________________________________
(Date of Event Which Requires Filing of this Statement)




     Check the  appropriate  box to  designate  the rule  pursuant to which this
Schedule is filed:

          [_]  Rule 13d-1(b)

          [x]  Rule 13d-1(c)

          [ ]  Rule 13d-1(d)


----------
(1)  The  remainder  of this  cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter the disclosures provided in a prior cover page.

     The  information  required in the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 or otherwise  subject to the  liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).
CUSIP No. 44779E106                 13G                 Page 2 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Limited

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]
________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Incorporated under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          4,421,915
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            4,421,915
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,421,915*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    5.93% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

CO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No. 44779E106                 13G                 Page 3 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Investment Services Inc.

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]
________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Incorporated under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          4,421,915
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            4,421,915
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,421,915*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    5.93% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

IA
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No. 44779E106                 13G                 Page 4 of 21 Pages

________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC American Focused Fund

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada
                     
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          1,884,010
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            1,884,010
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,884,010*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    2.53% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No. 44779E106                13G                 Page 5 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC American Focused Corporate Class

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund corporation incorporated under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          179,900
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            179,900
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    179,900*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.24% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No. 44779E106               13G                 Page 6 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC American Focused Plus Fund

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          30,235
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            30,235
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    30,235*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    .04% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No. 44779E106               13G                 Page 7 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Canadian Balanced Fund

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          414,174
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            414,175
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    414,175*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    .56% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing
CUSIP No. 44779E106               13G                 Page 8 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Canadian Balanced Corporate Class

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          21,491
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            21,491
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    21,491*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    .03% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

*	See item 2(a) of this filing
CUSIP No. 44779E106               13G                 Page 9 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Canadian Focused Fund

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          1,337,810
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            1,337,810
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,337,810*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    1.79% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing
CUSIP No. 44779E106               13G                 Page 10 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Canadian Focused Corporate Class

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          111,924
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            111,924
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    111,924*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    .15% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

*	See item 2(a) of this filing
    CUSIP No. 44779E106               13G                 Page 11 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     AIC Dividend Income Fund

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Mutual fund trust organized under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          442,370
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            442,370
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    442,370*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________

11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    .59% of outstanding Common Shares*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

OO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing
CUSIP No. 44779E106                 13G                    Page 12 of 21 Pages 



1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     Michael Lee-Chin

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY

________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Canadian
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          4,421,915
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            4,421,915
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,421,915*
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]
________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    5.93*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

IN
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


*See item 2(a) of this filing 



CUSIP No. 44779E106                 13G                 Page 13 of 21 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     Portland Holdings Inc.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [x]

________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

Incorporated under the laws of Ontario, Canada

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER                    
   SHARES           Nil
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER                    
  OWNED BY          4,421,915
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER                    
  REPORTING         Nil
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER                    
    WITH            4,421,915
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,421,915*

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

    Not applicable                                           [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    5.93*
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

CO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

* See item 2(a) of this filing

CUSIP No.  44779E106               13G                Page 14 of 21 Pages


_______________________________________________________________________________
Item 1(a).  Name of Issuer:

PetroKazakhstan

_______________________________________________________________________________
Item 1(b).  Address of Issuer's Principal Executive Offices:

1460 Sun Life Plaza North Tower, 140  4th Avenue S.W.
Calgary, Alberta  T2P 3N3

______________________________________________________________________________
Item 2(a).  Name of Person Filing:

AIC Limited (AIC) is a corporation incorporated under the laws of Ontario.
AICs wholly owned subsidiary AIC Investment Services Inc. (AISI) is the
portfolio manager of certain accounts (including the Funds and other investment
advisory accounts) and AIC is the manager and trustee of certain mutual funds 
in Ontario (collectively the Funds) which are owners of record of the 
securities of the Issuer.  AISI is qualified to act as an investment adviser 
to the Funds in Ontario, Canada pursuant to a registration under the Securities
Act Ontario.  AISI is registered as an investment adviser under Section 203 of 
the Investment Advisers Act of 1940.  AIC as trustee of the Funds, shares with 
the Funds the power to direct the voting and disposition of the shares of the 
Issuer held by the Funds. Michael Lee-Chin holds indirectly through his sole 
ownership of Portland Holdings Inc. approximately 95% of the voting equity 
securities of AIC and consequently he may be deemed under United States 
securities law to beneficially own the shares of the Issuer held by AIC as 
trustee of the Funds and by the Funds, although he disclaims beneficial 
ownership of such holding.  Mr. Lee-Chin is a citizen and resident of Canada.
_______________________________________________________________________________
Item 2(b).  Address of Principal Business Office, or if None, Residence:

1375 Kerns Road, Burlington, Ontario, Canada L7R 4X8

_______________________________________________________________________________
Item 2(c).  Citizenship:

Michael Lee-Chin - Canadian
AIC Limited- Incorporated under the laws of Ontario, Canada
AIC Investment Services Inc. - Incorporated under the laws of Ontario, Canada
Portland Holdings Inc. - Incorporated under the laws of Ontario, Canada
Funds - certain mutual fund trusts or corporation organized/incorporated under
the laws of Ontario, Canada 
_______________________________________________________________________________
Item 2(d).  Title of Class of Securities:

Common Shares
_______________________________________________________________________________
Item 2(e).  CUSIP Number

44779E106
_______________________________________________________________________________



CUSIP No. 44779E106               13G                    Page 15 of 21 Pages



Item 3.  If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b)
         or (c), Check Whether the Person Filing is a:

(a)  [_]  Broker or dealer registered under Section 15 of the Exchange Act.

(b)  [_]  Bank as defined in Section 3(a)(6) of the Exchange Act.

(c)  [_]  Insurance company as defined in Section 3(a)(19) of the Exchange
               Act.

(d)  [_]  Investment company registered under Section 8 of the Investment
               Company Act.

(e)  [_]  An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f)  [_]  An employee benefit plan or endowment fund in accordance with
               Rule 13d-1(b)(1)(ii)(F);

(g)  [_]  A parent holding company or control person in accordance with
               Rule 13d-1(b)(1)(ii)(G);

(h)  [_]  A savings association as defined in Section 3(b) of the Federal
               Deposit Insurance Act;

(i)  [_]  A church plan that is excluded from the definition of an
              investment company under Section 3(c)(13) of the Investment
               Company Act;

(j)  [_]  Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

If this statement is filed pursuant to Rule 13d-1(c), check this box. [x]





















CUSIP No. 44779E106                13G               Page 16 of 21 Pages

Item 4.  Ownership.

     Provide  the  following  information  regarding  the  aggregate  number 
and percentage of the class of securities of the issuer identified in Item 1.

     (a)  Amount beneficially owned:  4,421,915*

     (b)  Percent of class: 5.93*

     (c)  Number of shares as to which such person has:  

          (i)   Sole power to vote or to direct the vote Nil,

          (ii)  Shared power to vote or to direct the vote 4,421,915,

          (iii) Sole power to dispose or to direct the disposition of Nil,

          (iv)  Shared power to dispose or to direct the disposition of 
                4,421,915

          * See item 2(a)
________________________________________________________________________________
Item 5.  Ownership of Five Percent or Less of a Class.

         Inapplicable
________________________________________________________________________________
Item 6.  Ownership of More Than Five Percent on Behalf of Another Person.

         Inapplicable
________________________________________________________________________________
Item 7.  Identification and Classification of the Subsidiary which acquired
         the Security Being Reported on by the Parent Holding Company.

         Inapplicable
_______________________________________________________________________________
Item 8.  Identification and Classification of Members of the Group.

         Inapplicable
________________________________________________________________________________
Item 9.  Notice of Dissolution of Group.

         Inapplicable
________________________________________________________________________________
Item 10.  Certifications.


By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not
held for the purpose of or with the effect of changing or  influencing
the control of the issuer of the  securities and were not acquired and
are not held in connection with or as a participant in any transaction
having such purpose or effect.



CUSIP No. 44779E106                 13G                Page 17 of 21 Pages

                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, 
complete and correct.

May 20, 2005

AIC LIMITED

By    /s/Victoria J. Ringelberg     			05/20/2005
      Victoria J. Ringelberg, 		 		Date
	Chief Financial Officer


AIC Investment Services Inc.

By    /s/Victoria J. Ringelberg     			05/20/2005
      Victoria J. Ringelberg, 		 		Date
	Chief Financial Officer


AIC LIMITED as trustee for the
AIC AMERICAN FOCUSED FUND

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg, 				Date
	Chief Financial Officer


AIC LIMITED as manager for the
AIC AMERICAN FOCUSED CORPORATE CLASS

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer


AIC LIMITED as trustee for the
AIC AMERICAN FOCUSED PLUS FUND

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer

AIC LIMITED as trustee for the
AIC CANADIAN BALANCED FUND

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer




CUSIP No. 44779E106                  13G                Page 18 of 21 Pages

AIC LIMITED as manager for the
AIC CANADIAN BALANCED CORPORATE CLASS

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer

AIC LIMITED as trustee for the
AIC CANADIAN FOCUSED FUND

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer

AIC LIMITED as manager for the
AIC CANADIAN FOCUSED CORPORATE CLASS

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer

AIC LIMITED as trustee for the
AIC DIVIDEND INCOME FUND

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
	Chief Financial Officer

MICHAEL LEE-CHIN

By    /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
      Chief Financial Officer

Under Power of Attorney dated March 14, 2003.


PORTLAND HOLDINGS INC.

By   /s/Victoria J. Ringelberg				05/20/2005
      Victoria J. Ringelberg,					Date
      Chief Financial Officer

Under Power of Attorney dated March 14, 2003.


Attention. Intentional misstatements or omissions of fact constitute
federal criminal violations (see 18 U.S.C. 1001).







CUSIP No. 44779E106                  13G                Page 19 of 21 Pages


POWER OF ATTORNEY

The undersigned does hereby appoint Jonathan Wellum and Victoria Ringelberg and 
each of them, acting singly, with full power of substitution, as the true and 
lawful attorney of the undersigned, to sign on behalf of the undersigned in 
respect of the ownership or deemed ownership of equity securities held or 
deemed held by the undersigned, directly or beneficially, and to be reported 
pursuant to sections 13(d) and 13(g) of the Securities and Exchange Act of 1934,
as amended, and to execute joint filing agreements with respect to such filings.

IN WITNESS WHEREOF, this Power of Attorney, has been executed as of the 14th day
of March, 2003.

/s/Michael Lee Chin
Michael Lee Chin


JOINT FILING AGREEMENT

The persons named below agree to the joint filing on behalf of each of 
them of a Statement on Schedule 13G (including amendments thereto) with 
respect to the Common Shares of School Specialty, Inc. and further agree 
that this Joint Filing Agreement be included as an Exhibit to such joint 
filings.  In evidence thereof, the undersigned hereby execute this 
Agreement as of the 20th day of May, 2005.

AIC LIMITED

By  /s/Victoria J. Ringelberg
    Victoria J. Ringelberg,
    Chief Financial Officer


AIC INVESTMENT SERVICES INC.

By  /s/Victoria J. Ringelberg
    Victoria J. Ringelberg,
    Chief Financial Officer


AIC LIMITED as trustee for the
AIC AMERICAN FOCUSED FUND

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg,
      Chief Financial Officer


AIC LIMITED as manager for the
AIC AMERICAN FOCUSED CORPORATE CLASS

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg,
      Chief Financial Officer
CUSIP No. 44779E106                  13G                Page 20 of 21 Pages

AIC LIMITED as trustee for the
AIC AMERICAN FOCUSED PLUS FUND

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


AIC LIMITED as trustee for the
AIC CANADIAN BALANCED FUND

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


AIC LIMITED as manager for the
AIC CANADIAN BALANCED CORPORATE CLASS

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


AIC LIMITED as trustee for the
AIC CANADIAN FOCUSED FUND

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


AIC LIMITED as manager for the
AIC CANADIAN FOCUSED CORPORATE CLASS

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


AIC LIMITED as trustee for the
AIC DIVIDEND INCOME FUND

By    /s/Victoria J. Ringelberg
      Victoria J. Ringelberg
      Chief Financial Officer


MICHAEL LEE-CHIN

By  /s/Victoria J. Ringelberg
    Victoria J. Ringelberg,
    Chief Financial Officer

Under Power of Attorney dated March 14, 2003.
CUSIP No. 44779E106                  13G                Page 21 of 21 Pages


PORTLAND HOLDINGS INC.

By  /s/Victoria J. Ringelberg
    Victoria J. Ringelberg,
    Chief Financial Officer

Under Power of Attorney dated March 14, 2003.