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Registration No. 333-100829

811-09137

As Filed with the Securities and Exchange Commission on December 10, 2007

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-6

REGISTRATION UNDER THE SECURITIES ACT OF 1933 [ X ]

Pre-Effective Amendment No. ____ [ ]

Post-Effective Amendment No.__7__ [ X ]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [ X ]

Amendment No._47___ [ X ]

Sun Life of Canada (U.S.) Variable Account I

Registrant

Sun Life Assurance Company of Canada (U.S.)

Depositor

One Sun Life Executive Park

Wellesley Hills, Massachusetts 02481

Depositor's Address

1-800-700-6554

Depositor's Telephone Number

Bruce Teichner

Assistant Vice President and Senior Counsel

Sun Life Assurance Company of Canada (U.S.)

One Sun Life Executive Park

Wellesley Hills, Massachusetts 02481

Name and Address of Agent For Service

It is proposed that this filing will become effective (check appropriate box)

[ X ] immediately upon filing pursuant to paragraph (b) of Rule 485.

[ ] on (date) pursuant to paragraph (b) of Rule 485.

[ ] 60 days after filing pursuant to paragraph (a)(1) of Rule 485.

[ ] on (date) pursuant to paragraph (a)(1) of Rule 485.

[ ] This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Amendment No. 7 to the Registration Statement on Form N-6 (the "Registration Statement") (File Nos. 333-100829, 811-09137) is being filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended, in order to add a supplement to the prospectus filed with Post-Effective Amendment No. 6 to the Registration Statement, which was filed on April 27, 2007. This Amendment does not otherwise delete, amend, or supersede any prospectus, statement of additional information, exhibit, or other information contained in Post-Effective Amendment No. 6 the Registration Statement.

PART A

SUPPLEMENT DATED DECEMBER 10, 2007

PROSPECTUS DATED NOVEMBER 13, 2007

FOR SUN PRIME VARIABLE UNIVERSAL LIFE INSURANCE

PROSPECTUS DATED SEPTEMBER 19, 2007

FOR SUN EXECUTIVE VARIABLE UNIVERSAL LIFE INSURANCE

PROSPECTUSES DATED MAY 1, 2007

FOR FUTURITY ACCUMULATOR II VARIABLE UNIVERSAL LIFE INSURANCE,

FUTURITY PROTECTOR II VARIABLE UNIVERSAL LIFE INSURANCE, AND

FUTURITY SURVIVORSHIP II VARIABLE UNIVERSAL LIFE INSURANCE

ISSUED BY SUN LIFE ASSSURANCE COMPANY OF CANADA (U.S.)

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT I

On or about March 10, 2008, the above-captioned prospectuses are amended to add new investment options.

The following new investment options will be added to the above-captioned prospectuses on or about March 10, 2008.As a result,the list of the available investment options appearing on the cover page of each prospectus is supplemented by the addition of the following investment options and corresponding investment management disclosures:

Large-Cap Equity Funds	Short-Term Bond Funds
SC^SM Lord Abbett Growth & Income Fund	SC^SM Goldman Sachs Short Duration Fund
Mid-Cap Equity Funds	High Yield Bond Funds
SC^SM Goldman Sachs Mid Cap Value Fund	SC^SM PIMCO High Yield Fund

Sun Capital Advisers LLC advises the Sun Capital Funds; SC^SM Lord Abbett Growth & Income Fund (sub-advised by Lord, Abbett & Co. LLC), SC^SM Goldman Sachs Mid Cap Value Fund and SC^SM Goldman Sachs Short Duration Fund (sub-advised by Goldman Sachs Asset Management, L.P.), SC^SM PIMCO High Yield Fund (sub-advised by Pacific Investment Management Company LLC).

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

PART B

Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-6, File No. 333-100829, filed with the Securities and Exchange Commission on April 25, 2007.

PART C

ITEM 26. EXHIBITS

Resolution of the Board of Directors of Sun Life Assurance Company of Canada (U.S.), dated October 29, 1998, authorizing the establishment of Sun Life of Canada (U.S.) Variable Account I (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on December 9, 1998.)

None.

C.	Principal Underwriting Agreement (Incorporated herein by reference to Post-Effective Amendment No. 2 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on March 31, 2000.)

(1) Flexible Premium Combination Fixed and Variable Life Insurance Policy (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 26, 2001.)

(2) Accelerated Death Benefit Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(3) Accidental Death Benefit Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(4) Payment of Stipulated Premium Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(5) Waiver of Cost of Insurance Rider (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 12, 2001.)

(6) Supplemental Insurance Rider (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 12, 2001.)

Application for Flexible Premium Combination Fixed and Variable Life Insurance Policy (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 26, 2001.)

F.	(1) Certificate of Incorporation of Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to the Depositor's Form 10-K, File No. 333-82824, filed with the Securities and Exchange Commission on March 29, 2004.)

(2) Bylaws of the Depositor, as amended March 19, 2004 (Incorporated herein by reference to the Depositor's Form 10-K, File No. 333-82824, filed with the Securities and Exchange Commission on March 29, 2004.)

G.	Specimen Reinsurance Contract. (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form N-6, File No. 333-100829, filed with the Securities and Exchange Commission on October 30, 2002.)

H. (1) Participation Agreement, dated February 17, 1998, by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 1 to the Registration Statement on Form N-4, File No. 333-119151, filed with the Securities and Exchange Commission on February 3, 2000.)

(2) Amended and Restated Participation Agreement, dated December 13, 2004, by and among Sun Capital Advisers Trust, Sun Capital Advisers, Inc., Sun Life Insurance and Annuity Company of New York and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 8 to the Registration Statement on Form N-4, File No. 333-83516, filed with the Securities and Exchange Commission on April 28, 2005.)

(3) Amended and Restated Participation Agreement, dated September 1, 2004, by and among Sun Life Assurance Company of Canada (U.S.), Variable Insurance Products Fund and Fidelity Distributors Corporation (Incorporated herein by reference to Post-Effective Amendment No. 1 to the Registration Statement on Form N-4, File No. 333-119151, filed with the Securities and Exchange Commission on April 28, 2005.)

(4) Participation Agreement, dated September 1, 2002, by and among Sun Life Assurance Company of Canada (U.S.), Clarendon Insurance Agency, Inc., Alliance Capital Management L.P. and Alliance Fund Distributors, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 7 to the Registration Statement on Form N-4, File No. 333-82957, filed with the Securities and Exchange Commission on July 27, 2001.)

(5) Participation Agreement, dated September 16, 2002, by and among the Franklin Templeton Variable Insurance Products Trust, Franklin Templeton Distributors, Inc., Sun Life Insurance and Annuity Company of New York and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to the Registration Statement of KBL Variable Account A on Form N-4, File No. 333-102278, filed with the Securities and Exchange Commission on December 31, 2002.)

(6) Participation Agreement, dated February 17, 1998, by and among Goldman Sachs Variable Insurance Trust, Goldman, Sachs & Co., and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement on Form N-4, File No. 33-41628, filed with the Securities and Exchange Commission on April 26, 1999.)

(7) Amended and Restated Participation Agreement, dated November 6, 2002, by and among MFS/Sun Life Series Trust, Sun Life Insurance and Annuity Company of New York, Sun Life Assurance Company of Canada (U.S.), and Massachusetts Financial Services Company (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement on Form N-4, File No. 333-107983, filed with the Securities and Exchange Commission on May 28, 2004.)

(8) Participation Agreement, dated July 15, 2002, by and among Sun Life Assurance Company of Canada (U.S.), Deutsche Asset Management VIT Funds and Deutsche Asset Management, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 2 to the Registration Statement on Form S-6, File No. 333-65048, filed with the Securities and Exchange Commission on July 3, 2002.)

(9)

Participation Agreement, dated May 1, 2004, by and among Sun Life Assurance Company of Canada (U.S.), Scudder Variable Series II, Scudder Distributors, Inc. and Deutsche Investment Management Americas Inc. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement on Form N-6, File No. 333-100831, filed with the Securities and Exchange Commission on April 29, 2005.)

(10)

Participation Agreement, dated September 12, 2002, by and among Sun Life Assurance Company of Canada (U.S.), Sun Life Insurance and Annuity Company of New York, PIMCO Variable Insurance Trust and PIMCO Funds Distributors LLC. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement on Form N-6, File No. 333-59662, filed with the Securities and Exchange Commission on February 26, 2003.)

(11)

Participation Agreement, dated February 17, 1998, by and among Sun Life Assurance Company of Canada (U.S.), The Alger American Fund and Fred Alger and Company, Incorporated. (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(12)

Participation Agreement, dated February 17, 1998, by and among Sun Life Assurance Company of Canada (U.S.) and Lord, Abbett & Co. (Incorporated herein by reference to Post-Effective Amendment No. 8 to the Registration Statement on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 26, 2002.)

(13)

Amended and Restated Participation Agreement, dated August 1, 2004, by and among Sun Life Assurance Company of Canada (U.S.), Sun Life Insurance and Annuity Company of New York, T. Rowe Price Equity Series, Inc. and T. Rowe Price Investment Services, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(14)

Amended and Restated Participation Agreement, dated May 1, 2004, by and among Sun Life Assurance Company of Canada (U.S.), Sun Life Insurance and Annuity Company of New York, Dreyfus Variable Investment Fund, The Dreyfus Socially Responsible Growth Fund, Inc. and Dreyfus Life and Annuity Index Fund, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement on Form N-6, File No. 333-100831, filed with the Securities and Exchange Commission on April 29, 2005.)

(15)

Participation Agreement, dated August 6, 2004, by and among Sun Life Assurance Company of Canada (U.S.), Sun Life Insurance and Annuity Company of New York, Delaware VIP Trust, Delaware Management Company and Delaware Distributors, LP. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement on Form N-6, File No. 333-100831, filed with the Securities and Exchange Commission on April 29, 2005.)

(16)

Participation Agreement, dated August 6, 2004, by and among Sun Life Insurance and Annuity Company of New York, Van Kampen Life Investments Trust, Van Kampen Funds Inc., Van Kampen Asset Management. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement on Form N-6, File No. 333-100831, filed with the Securities and Exchange Commission on April 29, 2005).

(17)

Participation Agreement, dated December 31, 2002, by and among Oppenheimer Variable Account Funds, OppenheimerFunds, Inc. and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement on Form N-6, File No. 333-100831, filed with the Securities and Exchange Commission on April 29, 2005).

None.

J. (1) Powers of Attorney. (Incorporated herein by reference to Post-Effective Amendment No. 6 to the

Registration Statement on Form N-6, File No. 333-100829, filed with the Securities and Exchange

Commission on April 25, 2007.)

(2)

Resolution of the Board of Directors of the Depositor dated July 24, 2003, authorizing the use of Powers of Attorney for Officer signatures. (Incorporated herein by reference to the Registration Statement of Keyport Variable Account A on Form N-4, File No. 333-112506, filed with the Securities and Exchange Commission on February 5, 2004.)

K.	Legal Opinion. (Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-6, File No. 333-100829, filed with the Securities and Exchange Commission on April 25, 2007.)

L. None.

M. None.

N. Consent of Independent Registered Public Accounting Firm.

O. None.

P. None.

Q. None.

ITEM 27. DIRECTORS AND OFFICERS OF THE DEPOSITOR

Name and Principal

Business Address

Positions and Offices

With Depositor

Thomas A. Bogart Sun Life Assurance Company of Canada 150 King Street West Toronto, ON M5H 1J9	Director
Ronald Hiebert Friesen Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Director and Senior Vice President and Chief Financial Officer and Treasurer
Scott M. Davis Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Director and Vice President and General Counsel
Richard Paul McKenney Sun Life Assurance Company of Canada 150 King Street West Toronto, Ontario Canada M5H 1J9	Director
Mary Martha Fay Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Director and Senior Vice President and General Manager, Annuities
Robert C. Salipante Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Director and President
Donald A. Stewart Sun Life Assurance Company of Canada 150 King Street West Toronto, Ontario Canada M5H 1J9	Director and Chairman
Michele G. Van Leer Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Senior Vice President & General Manager, Individual Insurance
James M.A. Anderson Sun Life Assurance Company of Canada 150 King Street West Toronto, ON M5H 1J9	Executive Vice President and Chief Investment Officer
Keith Gubbay Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Senior Vice President and Chief Actuary
Michael S. Bloom Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Assistant Vice President and Senior Counsel and Secretary
Michael K. Moran Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Vice President and Chief Accounting Officer and Controller
John R. Wright Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park Wellesley Hills, MA 02481	Executive Vice President, Sun Life Financial U.S. Operations

ITEM 28. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE DEPOSITOR OR THE REGISTRANT

No person is directly or indirectly controlled by the Registrant. The Registrant is a separate account of Sun Life Assurance Company of Canada (U.S.), which is ultimately controlled by Sun Life Financial.

The organization chart of Sun Life Financial is incorporated by reference to Pre-Effective Amendment No. 2 to the Registration Statement on Form N-6 of Sun Life of Canada (U.S.) Variable Account I, File No. 333-143353, filed September 19, 2007.

None of the companies listed in such organization chart is a subsidiary of the Registrant; therefore, the only financial statements being filed are those of Sun Life Assurance Company of Canada (U.S.).

ITEM 29. INDEMNIFICATION

Pursuant to Section 145 of the Delaware Corporation Law, Article 8 of the By-laws of Sun Life Assurance Company of Canada (U.S.) provides for the indemnification of directors, officers and employees of Sun Life Assurance Company of Canada (U.S.). Insofar as indemnification for liability arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of Sun Life Assurance Company of Canada (U.S.) pursuant to the certificate of incorporation, by-laws, or otherwise, Sun Life (U.S.) has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by Sun Life (U.S.) of expenses incurred or paid by a director, officer, controlling person of Sun Life (U.S.) in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, Sun Life (U.S.) will submit to a court of appropriate jurisdiction the question whether such indemnification by them is against public policy as expressed in the Act, unless in the opinion of their counsel the matter has been settled by controlling precedent, and will be governed by the final adjudication of such issue.

ITEM 30. PRINCIPAL UNDERWRITERS

Clarendon Insurance Agency, Inc., which is a wholly-owned subsidiary of Sun Life Assurance Company of Canada (U.S.), acts as general distributor for the Registrant, Sun Life of Canada (U.S.) Variable Accounts C, D, E, F, G and K, Keyport Variable Account A, KMA Variable Account, Keyport Variable Account I, KBL Variable Account A, KBL Variable Annuity Account, Sun Life (N.Y.) Variable Accounts A, B, C, D, J and N, and Money Market Variable Account, High Yield Variable Account, Capital Appreciation Variable Account, Government Securities Variable Account, World Governments Variable Account and Total Return Variable Account.

Name and Principal	Position and Offices
Business Address*	with Underwriter

Katherine E. Sarvary	President
Scott M. Davis	Director
Michele G. Van Leer	Director
Mary M. Fay	Director
Ann B. Teixeira	Assistant Vice President, Compliance
Michael S. Bloom	Secretary
Kathleen T. Baron	Chief Compliance Officer
Michael L. Gentile	Vice President
Raymond Scanlon	Vice President
William T. Evers	Assistant Vice President and Senior Counsel
Nancy C. Atherton	Assistant Vice President & Tax Officer
Jane F. Jette	Financial/Operations Principal and Treasurer
Amy E. Mercer	Assistant Secretary
Alyssa M. Gair	Assistant Secretary

* The principal business address of all directors and officers of the principal underwriter is One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481.

ITEM 31. LOCATION OF ACCOUNTS AND RECORDS

Accounts, books and other documents required to be maintained by Section 31(a) of the Investment Company Act of 1940 and the Rules promulgated thereunder are maintained, in whole or in part, by Sun Life Assurance Company of Canada (U.S.) at its offices at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481 or at the offices of Clarendon Insurance Agency, Inc., at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481.

ITEM 32. MANAGEMENT SERVICES

Not applicable.

ITEM 33. FEE REPRESENTATION

Sun Life Assurance Company of Canada (U.S.)("Sun Life of Canada (U.S.)") hereby represents that the aggregate fees and charges under the Policy are reasonable in relation to the services rendered, the expenses expected to be incurred, and the risks assumed by Sun Life (U.S.).

SIGNATURES

As required by the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements of Securities Act Rule 485(b) for effectiveness of this Post-Effective Amendment to the Registration Statement and has caused this Post-Effective Amendment to the Registration Statement to be signed on its behalf, in the Town of Wellesley Hills, and Commonwealth of Massachusetts on this 10th day of December, 2007.

	SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT I
	(Registrant)

	SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
	(Depositor)

	By: /s/ Robert C. Salipante*
	Robert C. Salipante
	President

*By:	/s/ Sandra M. DaDalt
	Sandra M. DaDalt
	Assistant Vice President & Senior Counsel

As required by the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities with the Depositor, Sun Life Assurance Company of Canada (U.S.), and on the dates indicated.

SIGNATURE	TITLE	DATE

/s/ Robert C. Salipante*	Director and President	December 10, 2007
Robert C. Salipante	(Principal Executive Officer)

/s/ Ronald H. Friesen*	Director and Senior Vice President and	December 10, 2007
Ronald H. Friesen	Chief Financial Officer and Treasurer
	(Principal Financial Officer)

/s/ Michael K. Moran*	Vice President and Chief Accounting Officer and	December 10, 2007
	Controller
	(Principal Accounting Officer)

*By: /s/ Sandra M. DaDalt	Attorney-in-Fact for:	December 10, 2007
Sandra M. DaDalt	Donald A. Stewart, Director
	Richard P. McKenney, Director
	Thomas A. Bogart, Director
	Scott M. Davis, Director
	Mary M. Fay, Director

*Sandra M. DaDalt has signed this document on the indicated date on behalf of the above Directors and Officers for the Depositor pursuant to powers or attorney duly executed by such persons and a resolution of the Board of Directors authorizing use of powers of attorney for Officer signatures. Resolution of the Board of Directors is incorporated herein by reference to the Registration Statement of Keyport Variable Account A on Form N-4, File No. 333-112506, filed on or about February 5, 2004. Powers of attorney are incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-6, File No. 333-100829, filed with the Securities and Exchange Commission on April 25, 2007.

EXHIBIT INDEX





N	Consent of Independent Registered Public Accounting Firm

	Representation of Counsel Pursuant to Rule 485(b)