Document:

Exhibit 4.1

 Exhibit 4.1 
  

						
	 No. _______
	  	TAC ACQUISITION CORP.	  	________ UNIT	(S)
			
	 CUSIP NO. _______
	  	Incorporated under the Laws of the State of Delaware	  	 	 

  
 UNIT(S) CONSISTING OF
ONE SHARE OF COMMON STOCK AND TWO WARRANTS, EACH TO PURCHASE ONE SHARE OF COMMON STOCK 
  
 SEE REVERSE FOR CERTAIN DEFINITIONS 
  
 THIS CERTIFIES THAT _______________________________________________________________________ IS THE OWNER OF ________________________________________________________________________________________________ UNIT(S). Each Unit
(“Unit”) consists of one (1) share of common stock, par value $.0001 per share (“Common Stock”), of TAC Acquisition Corp., a Delaware corporation (the “Corporation”), and two warrants (the “Warrants”). Each
Warrant entitles the holder to purchase one (1) share of Common Stock for $5.00 per share (subject to adjustment). The Common Sock and Warrants comprising each Unit represented by this certificate are not transferable separately prior to
                    , 2005, unless Wedbush Morgan Securities Inc. determines that an earlier date is acceptable. The terms of the Warrants are
governed by a Warrant Agreement, dated as of                     , 2005 (the “Warrant Agreement”), between the Corporation and The
Bank of New York, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant Agreement are on file at the
office of the Warrant Agent at 101 Barclay Street (11E), New York, NY 10286, and are available to any Warrant holder on written request and without cost. This certificate is not valid unless countersigned by the Transfer Agent and registered by the
Registrar of the Corporation. 
  
 WITNESS the seal of the Corporation and
the facsimile signature of its duly authorized officers. 
  
 Dated:
                    , 2005 
  

					
	 	 	TAC ACQUISITION CORP.	 	 
	Secretary	 	  
 CORPORATE SEAL
	 	Chief Executive Officer
	 	 	2005	 	 
	 	 	DELAWARE	 	 
	Transfer Agent	 	 	 	 

  

 The following abbreviations, when used in the inscription on the face of this certificate, shall be
construed as though they were written out in full according to applicable laws or regulations: 
  

											
	TEN COM	  	as tenants in common	  	Unif Gift Min Act -	  	 	 	Custodian	  	 
	TEN ENT	  	tenants by the entireties	  	 	  	(Cust)	 	 	  	(Minor)
	JT TEN	  	 as joint tenants with right of survivorship
 and not as tenants in common
	  	 	  	Under Uniform Gifts to Minors
	 	  	  	 	  	Act: _____________________
	 	  	  	 	  	(State)

  
 Additional
abbreviations may also be used though not in the above list. 
  
 TAC Acquisition Corp. 
  
 The Corporation will
furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, option or other special rights of each class of stock or series thereof of the Corporation and the qualifications,
limitations, or restrictions of such preferences and/or rights. This certificate and the Units represented hereby are issued and shall be held subject to the terms and conditions applicable to the securities underlying and comprising the Units.

  
 For Value Received,
                     hereby sell, assign and transfer unto 
  
 PLEASE INSERT SOCIAL SECURITY OR OTHER 
 IDENTIFYING NUMBER OF ASSIGNEE 
 ___________________________________________ 
  
 ____________________________________________________________________________________________________________ 
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) 
  
 Units represented by the within Certificate, and do hereby irrevocably constitute and appoint
                     Attorney, to transfer the said Units on the books of the within named Corporation with full power of substitution in the
premises. 
  

									
				
	Dated ______________________	 	 	 	By:	 	 
	 	 	 	 	 	 	NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY
CHANGE WHATEVER.

  
 Signature(s) Guaranteed: 

 

			
		
	By:	 	 
	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).Exhibit 10.1

 Exhibit 10.1 
  
 [FORM OF LETTER AGREEMENT TO BE ENTERED INTO BY AND BETWEEN THE 
 REGISTRANT AND EACH OF THE INITIAL STOCKHOLDERS] 
  
                     , 2005

  
 TAC ACQUISITION CORP. 
 8 Sound Shore Drive, Suite 255 
 Greenwich, CT 06830 
  

	 	Re:	TAC Acquisition Corp. Initial Public Offering – Letter Agreement 

  
 Dear Ladies and Gentlemen: 
  
 This letter is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by
and between TAC Acquisition Corp., a Delaware corporation (the “Company”), and Wedbush Morgan Securities Inc., as Representative (the “Representative”) of the several Underwriters named in Schedule I
thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”) of the Company’s units (the “Units”), each comprised of one share of the
Company’s common stock, par value $0.0001 per share (the “Common Stock”), and two warrants, each of which are exercisable for one share of Common Stock (each, a “Warrant”). The capitalized terms
set forth on Schedule 1 attached hereto are hereby incorporated by reference herein. 
  
 In order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit that such IPO will confer upon the undersigned as a
stockholder of the Company, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as follows: 
  
 1. If the Company solicits approval of its stockholders of a Business Combination, the
undersigned shall vote all Insider Shares owned by such person in accordance with the majority of the votes with respect to IPO Shares by the holders thereof. 
  

2. If a Transaction Failure occurs, the undersigned shall take all reasonable actions to cause (i) the Trust Fund to be liquidated and distributed to the
holders of the IPO Shares no later than the Termination Date, and (ii) the Company to dissolve and liquidate. The undersigned hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any
distribution of the Trust Fund with respect to such person’s Insider Shares, but only such Insider Shares and not with respect to any IPO Shares acquired by the undersigned, and hereby waives any Claim the undersigned may have in the future as
a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse for any Claim against the Trust Fund for any reason whatsoever. The undersigned hereby agrees that the Company shall be entitled to a
reimbursement from the undersigned for any distribution of the Trust Fund received by the undersigned in respect to such person’s Insider Shares. 
  

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 Letter Agreement - Company 

 3. In order to minimize potential conflicts of interest which may arise from multiple affiliations, the
undersigned agrees to present to the Company for its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire all or substantially all of the outstanding equity securities of, or otherwise acquire a
controlling equity interest in, an operating business in the technology-related sector, until the earlier of the consummation by the Company of a Business Combination, the distribution of the Trust Fund or until such time as the undersigned ceases
to be an officer or director of the Company; provided, however, that the presentation of such opportunities to the Company shall in each case be subject to any fiduciary obligation of the undersigned’s arising from a relationship
established prior to the undersigned’s fiduciary relationship with the Company. 
  
 4. The undersigned shall not, and shall cause any member of such person’s Immediate Family or any affiliate of such person not to, accept any compensation for services rendered to the Company prior to the Business Combination
Date; provided, that the undersigned shall be entitled to receive reimbursement from the Company for such person’s out-of-pocket expenses incurred in connection with seeking and consummating a Business Combination as contemplated in the
Prospectus. 
  
 5. The undersigned shall not, and shall cause any member of
such person’s Immediate Family or any affiliate of such person not to, accept a finder’s fee or any other compensation in the event the undersigned, any member of such person’s Immediate Family or any affiliate of such person
originates a Business Combination other than as contemplated herein or in the Prospectus. 
  
 6. The undersigned hereby agrees to be [the                      of the Company][ and
][ a member of the Board of Directors] of the Company until the earlier of (i) the Business Combination Date and (ii) the Termination Date. 
  
 7. The undersigned represents and warrants that (i) the biographical information furnished to the Company and the Representative and attached hereto as Exhibit
A is true and accurate in all respects (other than de minimis errors or omissions), does not omit any material information with respect to the undersigned’s background during the previous five years and contains all of the information
required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities Act of 1933, as amended, (ii) the questionnaires furnished by the undersigned to the Company and the Representative are true and accurate in all
respects (other than de minimis errors or omissions), and (iii) the undersigned has full right and power, without violating any agreement by which the undersigned is bound, to enter into this letter agreement and to serve as [
                     ][ and ][ a member of the Board of Directors] of the Company. The undersigned further represents and
warrants that: 
  
 (a) The undersigned is not subject to
or a respondent in any legal action for, any injunction, cease-and-desist order or order or stipulation to desist or refrain from any act or practice relating to the offering of securities in any jurisdiction; 
  
 (b) The undersigned has never been convicted of or pleaded guilty to
any crime (i) involving any fraud or (ii) relating to any financial transaction or handling of funds of 

  

 2 
 Letter Agreement - Company 

 
another person, or (iii) pertaining to any dealings in any securities and such person is not currently a defendant in any such criminal proceeding; and

  
 (c) The undersigned has never been suspended or
expelled from membership in any securities or commodities exchange or association or had a securities or commodities license or registration denied, suspended or revoked. 
  
 The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements,
representations and warranties set forth herein in proceeding with the IPO. 
  
 This letter agreement shall be binding on the undersigned and such person’s respective successors, heirs, personal representatives and assigns. This letter agreement shall terminate on the earlier of (i) the
Business Combination Date and (ii) the Termination Date. 
  
 This
letter agreement shall be governed by and interpreted and construed in accordance with the laws of the State of New York applicable to contracts formed and to be performed entirely within the State of New York, without regard to the conflicts of law
provisions thereof to the extent such principles or rules would require or permit the application of the laws of another jurisdiction. 
  
 No term or provision of this letter agreement may be amended, changed, waived, altered or modified except by written instrument executed and delivered by
the party against whom such amendment, change, waiver, alteration or modification is to be enforced. 
  
 [The Remainder of this Page is Intentionally Left Blank] 
  

 3 
 Letter Agreement - Company 

			
	 Sincerely,

		
	 By:
	 	 
	 	 	 Name:

	 	 	 Title:

  

			
	 Accepted and agreed:

	
	 TAC ACQUISITION CORP.

		
	 By:
	 	 
	 Name:
	 	 
	 Title:
	 	 

  

 4 
 Letter Agreement - Company 

  
 Schedule 1 

 
 SUPPLEMENTAL COMMON DEFINITIONS 
  
 Unless the context shall otherwise require, the following terms shall
have the following respective meanings for all purposes, and the following definitions are equally applicable to both the singular and the plural forms and the feminine, masculine and neuter forms of the terms defined. 
  
 “Business Combination” shall mean the acquisition by the
Company, whether by merger, capital stock exchange, asset acquisition or other similar type of combination, of one or more operating businesses in the technology-related sector, having, collectively, a fair market value (as calculated in accordance
with the Company’s Amended and Restated Certificate of Incorporation) of at least 80% of the Company’s net assets at the time of such merger, capital stock exchange, asset acquisition or other similar type of combination. 
  
 “Business Combination Date” shall mean the date upon which a
Business Combination is consummated, as conclusively established by a majority of the Independent Directors of the Company immediately following a Business Combination. 
  
 “Effective Date” shall mean the date upon which the Registration Statement is declared effective under the
Securities Act of 1933, as amended, by the SEC. 
  
 “Immediate Family” shall mean, with respect to any person, such person’s spouse, lineal descendents, father, mother, brothers or sisters (including any such relatives by adoption or marriage). 
  
 “Independent Directors” shall mean the Company’s
directors that qualify as “independent” under NASD Rule 4200(a)(15), as amended. 
  
 “Insiders” shall mean all of the officers, directors and stockholders of the Company immediately prior to the Company’s IPO. 
  
 “Insider Shares” shall mean all shares of Common Stock of the Company owned by an Insider immediately prior
to the Company’s IPO. For the avoidance of doubt, Insider Shares shall not include any IPO Shares purchased by Insiders in connection with or subsequent to the Company’s IPO. 
  
 “IPO Shares” shall mean all shares of Common Stock issued by the Company in its IPO, regardless of whether
such shares were issued to an Insider or otherwise. 
  

 “Prospectus” shall mean the final prospectus filed pursuant to Rule 424(b) under the
Securities Act of 1933, as amended, and included in the Registration Statement. 
  
 “Registration Statement” shall mean the registration statement filed by the Company on Form S-1 (No. 333-123382) with the SEC on March 17, 2005, and any amendment or supplement thereto, in connection
with the Company’s IPO. 
  
 “SEC” shall mean
the United States Securities and Exchange Commission. 
  
 “Termination Date” shall mean the date that is sixty (60) calendar days immediately following the Transaction Failure Date (inclusive thereof). 
  
 “Transaction Failure” shall mean the earlier of (i) the failure to enter into a letter of intent,
definitive agreement or agreement in principle with respect to a Business Combination on any day during the twelve-month period immediately following the Effective Date, and (ii) the failure to consummate a Business Combination on any day during the
eighteen-month period immediately following the Effective Date. 
  
 “Transaction Failure Date” shall mean the date upon which a Transaction Failure occurs, as conclusively established by a majority of the Independent Directors of the Company immediately following a Transaction Failure.

  
 “Trust Fund” shall mean that certain trust
account established with The Bank of New York and in which the Company deposited the “funds to be held in trust”, as described in the Prospectus. 
  

  
 Exhibit A 

 
 BIOGRAPHY 
  
 [ Insert Bio here ]

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