Document:

November
      17, 2006

    

    

    Columbus
      Acquisition Corp.

    590
      Madison Avenue

    New
      York,
      New York 10022

    

    

    Ladenburg
      Thalmann & Co. Inc.

    153
      East
      53rd
      Street,
      49th
      Floor

    New
      York,
      New York 10022

    

    

    
      	 	 	
              Re:

            	
              Initial
                Public Offering

            

    

    

    Gentlemen:

    

    The
      undersigned stockholder and director of Columbus Acquisition Corp. (“Company”),
      in consideration of Ladenburg Thalmann & Co. Inc. (“Ladenburg”) entering
      into a letter of intent (“Letter of Intent”) to underwrite an initial public
      offering of the securities of the Company (“IPO”) and embarking on the IPO
      process, hereby agrees as follows (certain capitalized terms used herein are
      defined in paragraph 14 hereof):

    

    1. If
      the
      Company solicits approval of its stockholders of a Business Combination, the
      undersigned will vote all Insider Shares owned by him in accordance with the
      majority of the votes cast by the holders of the IPO Shares. 

    

    2. In
      the
      event that the Company fails to consummate a Business Combination within 24
      months from the effective date (“Effective Date”) of the registration statement
      relating to the IPO, the undersigned will (i) cause the Trust Fund (as defined
      in the Letter of Intent) to be liquidated and distributed to the holders of
      IPO
      Shares and (ii) take all reasonable actions within his power to cause the
      Company to liquidate as soon as reasonably practicable. The undersigned hereby
      waives any and all right, title, interest or claim of any kind in or to any
      distribution of the Trust Fund and any remaining net assets of the Company
      as a
      result of such liquidation with respect to the Insider Shares beneficially
      owned
      by him (“Claim”) 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 against the Trust Fund for any reason
      whatsoever.

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    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 an operating business, until the earlier of the
      consummation by the Company of a Business Combination, the liquidation of the
      Company or until such time as the undersigned ceases to be a director of the
      Company, subject to any pre-existing fiduciary and contractual obligations
      the
      undersigned might have.

    

    4. The
      undersigned acknowledges and agrees that the Company will not consummate any
      Business Combination which involves a company which is affiliated with any
      of
      the Insiders unless
      the Company obtains an opinion from an independent investment banking firm
      reasonably acceptable to Ladenburg that the business combination is fair to
      the
      Company’s stockholders from a financial perspective.

     

    5. Neither
      the undersigned, any member of the family of the undersigned, nor any affiliate
      (“Affiliate”) of the undersigned will be entitled to receive and will not accept
      any compensation for services rendered to the Company prior to or in connection
      with the consummation of the Business Combination; provided that commencing
      on
      the Effective Date, Renova U.S. Management LLC (“Related Party”), shall be
      allowed to charge the Company $7,500 per month, representing an allocable share
      of Related Party’s overhead, to compensate it for the Company’s use of Related
      Party’s offices, utilities and personnel. The undersigned shall also be entitled
      to reimbursement from the Company for his out-of-pocket expenses incurred in
      connection with seeking and consummating a Business Combination.  

     

    6. Neither
      the undersigned, any member of the family of the undersigned, nor any Affiliate
      of the undersigned will be entitled to receive or accept a finder’s fee or any
      other compensation in the event the undersigned, any member of the family of
      the
      undersigned or any Affiliate of the undersigned originates a Business
      Combination. 

    

    7. The
      undersigned will escrow all of his Insider Shares acquired prior to the IPO
      until one year after the Company consummates a Business Combination, subject
      to
      the terms of a Stock Escrow Agreement which the Company will enter into with
      the
      undersigned and an escrow agent acceptable to the Company.

    

    8. The
      undersigned agrees to be a Director of
      the
      Company until the earlier of the consummation by the Company of a Business
      Combination or the liquidation of the Company. The undersigned’s biographical
      information furnished to the Company and Ladenburg and attached hereto as
      Exhibit A is true and accurate in all respects, does not omit any material
      information with respect to the undersigned’s background 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. The undersigned’s Questionnaire
      furnished to the Company and Ladenburg and annexed as Exhibit B hereto is
      true and accurate in all respects. The undersigned represents and warrants
      that:

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

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

    

    (c) he
      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.

    

    9. The
      undersigned has full right and power, without violating any agreement by which
      he is bound, to enter into this letter agreement and to serve as a Director
      of
      the Company.

    

    10. The
      undersigned hereby waives his right to exercise conversion rights with respect
      to any shares of the Company’s common stock owned or to be owned by the
      undersigned, directly or indirectly, and agrees that he will not seek conversion
      with respect to such shares in connection with any vote to approve a Business
      Combination.

    

    11. The
      undersigned hereby agrees to not propose, or vote in favor of, an amendment
      to
      the Company’s Certificate of Incorporation to extend the period of time in which
      the Company must consummate a Business Combination prior to its liquidation.
      Should such a proposal be put before stockholders other than through actions
      by
      the undersigned, the undersigned hereby agrees to vote against such proposal.
      This paragraph may not be modified or amended under any
      circumstances.

    

    12. The
      undersigned authorizes any employer, financial institution, or consumer credit
      reporting agency to release to Ladenburg and its legal representatives or agents
      (including any investigative search firm retained by Ladenburg) any information
      they may have about the undersigned’s background and finances (“Information”).
      Neither Ladenburg nor its agents shall be violating the undersigned’s right of
      privacy in any manner in requesting and obtaining the Information and the
      undersigned hereby releases them from liability for any damage whatsoever in
      that connection.

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    13. This
      letter agreement shall be governed by and construed and enforced in accordance
      with the laws of the State of New York, without giving effect to conflicts
      of
      law principles that would result in the application of the substantive laws
      of
      another jurisdiction.  

    

    14. As
      used
      herein, (i) a “Business Combination” shall mean an acquisition by merger,
      capital stock exchange, asset or stock acquisition, reorganization or otherwise,
      of an operating business; (ii) “Insiders” shall mean all officers, directors and
      stockholders of the Company immediately prior to the IPO; (iii) “Insider Shares”
shall mean all of the shares of Common Stock of the Company acquired by an
      Insider prior to the IPO or privately from the Company simultaneously with
      the
      IPO; and (iv) “IPO Shares” shall mean the shares of Common Stock issued in the
      Company’s IPO.

    

    

    
 

    

    [Signature
      page follows]

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    
      	 	 	 
	 	ROLF
              ZIMMERMANN
	 
 	 
 	 
 
	 	  	/s/ Rolf
              Zimmermann
	 	
              
Signature
	 	 

    

     

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    Exhibit
      A

    

    Rolf
      Zimmermann has been a member of our Board of Directors since November 2006.
      Since August 2006, Mr. Zimmermann has been the Chief Executive Officer of Müller
      Weingarten AG, Germany, a global leader in the metal forming business, with
      particular focus on presses for the automotive industry. Since May 2005, Mr.
      Zimmermann has also been a Managing Partner of Atlantic European Beratungs
      GmbH,
a
      privately-held investment company with focus on restructurings and investments
      in European "old-economy" manufacturing industries, notably
      in the areas of automotive, machine tools, and aerospace. In
      addition, since 2002, Mr. Zimmermann has been the Managing Partner of his own
      consulting company, Rolf Zimmermann Consulting GmbH, focusing on consulting
      and
      investing in the automotive supplier and other manufacturing industries in
      Germany. Mr. Zimmermann has over thirty five years’ experience in automotive
      manufacturing having originally trained as a mechanical engineer. From 1997
      to
      2002, Mr. Zimmermann was Chief Executive Officer of Ford AG, Germany as well
      as
      Corporate Vice President of the Ford Motor Company, Detroit, in charge of
      European Manufacturing. From 1996 to 1997, Mr. Zimmermann was a member of the
      Board of Managing Directors, in charge of Production and Development at
one
      of
      the world’s oldest car manufacturers,
      the
      Czech Škoda,
      founded in 1905 and owned since 1990 by Volkswagen AG.
      Prior
      to 1996, Mr. Zimmermann held various management positions in plant and vehicle
      production divisions at General Motors and its German subsidiary, Adam Opel
      AG.
      Mr. Zimmermann is a Non-Executive Director at Wagon Plc, Birmingham, UK, a
      London Stock Exchange-listed European automotive supplier, where he serves
      on
      the audit, nomination and remuneration committees. In addition, Mr. Zimmermann
      serves as an outside director to Flexible Solutions Group, Karlsruhe, Germany,
      a
manufacturer
      of compensators for the automotive industry and other industrial
      applications.
      Mr.
      Zimmermann received a Dipl. Eng. from the University of Applied Science,
      Wiesbaden.November
      17, 2006

    

    

    Columbus
      Acquisition Corp.

    590
      Madison Avenue

    New
      York,
      New York 10022

    

    

    Ladenburg
      Thalmann & Co. Inc.

    153
      East
      53rd
      Street,
      49th
      Floor

    New
      York,
      New York 10022

    

    

    
      	 	 	
              Re:

            	
              Initial
                Public Offering

            

    

    

    Gentlemen:

    

    The
      undersigned stockholder and director of Columbus Acquisition Corp. (“Company”),
      in consideration of Ladenburg Thalmann & Co. Inc. (“Ladenburg”) entering
      into a letter of intent (“Letter of Intent”) to underwrite an initial public
      offering of the securities of the Company (“IPO”) and embarking on the IPO
      process, hereby agrees as follows (certain capitalized terms used herein are
      defined in paragraph 14 hereof):

    

    1. If
      the
      Company solicits approval of its stockholders of a Business Combination, the
      undersigned will vote all Insider Shares owned by him in accordance with the
      majority of the votes cast by the holders of the IPO Shares. 

    

    2. In
      the
      event that the Company fails to consummate a Business Combination within 24
      months from the effective date (“Effective Date”) of the registration statement
      relating to the IPO, the undersigned will (i) cause the Trust Fund (as defined
      in the Letter of Intent) to be liquidated and distributed to the holders of
      IPO
      Shares and (ii) take all reasonable actions within his power to cause the
      Company to liquidate as soon as reasonably practicable. The undersigned hereby
      waives any and all right, title, interest or claim of any kind in or to any
      distribution of the Trust Fund and any remaining net assets of the Company
      as a
      result of such liquidation with respect to the Insider Shares beneficially
      owned
      by him (“Claim”) 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 against the Trust Fund for any reason
      whatsoever.

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    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 an operating business, until the earlier of the
      consummation by the Company of a Business Combination, the liquidation of the
      Company or until such time as the undersigned ceases to be a director of the
      Company, subject to any pre-existing fiduciary and contractual obligations
      the
      undersigned might have.

    

    4. The
      undersigned acknowledges and agrees that the Company will not consummate any
      Business Combination which involves a company which is affiliated with any
      of
      the Insiders unless
      the Company obtains an opinion from an independent investment banking firm
      reasonably acceptable to Ladenburg that the business combination is fair to
      the
      Company’s stockholders from a financial perspective.

     

    5. Neither
      the undersigned, any member of the family of the undersigned, nor any affiliate
      (“Affiliate”) of the undersigned will be entitled to receive and will not accept
      any compensation for services rendered to the Company prior to or in connection
      with the consummation of the Business Combination; provided that commencing
      on
      the Effective Date, Renova U.S. Management LLC (“Related Party”), shall be
      allowed to charge the Company $7,500 per month, representing an allocable share
      of Related Party’s overhead, to compensate it for the Company’s use of Related
      Party’s offices, utilities and personnel. The undersigned shall also be entitled
      to reimbursement from the Company for his out-of-pocket expenses incurred in
      connection with seeking and consummating a Business Combination.  

     

    6. Neither
      the undersigned, any member of the family of the undersigned, nor any Affiliate
      of the undersigned will be entitled to receive or accept a finder’s fee or any
      other compensation in the event the undersigned, any member of the family of
      the
      undersigned or any Affiliate of the undersigned originates a Business
      Combination. 

    

    7. The
      undersigned will escrow all of his Insider Shares acquired prior to the IPO
      until one year after the Company consummates a Business Combination, subject
      to
      the terms of a Stock Escrow Agreement which the Company will enter into with
      the
      undersigned and an escrow agent acceptable to the Company.

    

    8. The
      undersigned agrees to be a Director of
      the
      Company until the earlier of the consummation by the Company of a Business
      Combination or the liquidation of the Company. The undersigned’s biographical
      information furnished to the Company and Ladenburg and attached hereto as
      Exhibit A is true and accurate in all respects, does not omit any material
      information with respect to the undersigned’s background 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. The undersigned’s Questionnaire
      furnished to the Company and Ladenburg and annexed as Exhibit B hereto is
      true and accurate in all respects. The undersigned represents and warrants
      that:

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

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

    

    (c) he
      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.

    

    9. The
      undersigned has full right and power, without violating any agreement by which
      he is bound, to enter into this letter agreement and to serve as a Director
      of
      the Company.

    

    10. The
      undersigned hereby waives his right to exercise conversion rights with respect
      to any shares of the Company’s common stock owned or to be owned by the
      undersigned, directly or indirectly, and agrees that he will not seek conversion
      with respect to such shares in connection with any vote to approve a Business
      Combination.

    

    11. The
      undersigned hereby agrees to not propose, or vote in favor of, an amendment
      to
      the Company’s Certificate of Incorporation to extend the period of time in which
      the Company must consummate a Business Combination prior to its liquidation.
      Should such a proposal be put before stockholders other than through actions
      by
      the undersigned, the undersigned hereby agrees to vote against such proposal.
      This paragraph may not be modified or amended under any
      circumstances.

    

    12. The
      undersigned authorizes any employer, financial institution, or consumer credit
      reporting agency to release to Ladenburg and its legal representatives or agents
      (including any investigative search firm retained by Ladenburg) any information
      they may have about the undersigned’s background and finances (“Information”).
      Neither Ladenburg nor its agents shall be violating the undersigned’s right of
      privacy in any manner in requesting and obtaining the Information and the
      undersigned hereby releases them from liability for any damage whatsoever in
      that connection.

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    13. This
      letter agreement shall be governed by and construed and enforced in accordance
      with the laws of the State of New York, without giving effect to conflicts
      of
      law principles that would result in the application of the substantive laws
      of
      another jurisdiction.  

    

    14. As
      used
      herein, (i) a “Business Combination” shall mean an acquisition by merger,
      capital stock exchange, asset or stock acquisition, reorganization or otherwise,
      of an operating business; (ii) “Insiders” shall mean all officers, directors and
      stockholders of the Company immediately prior to the IPO; (iii) “Insider Shares”
shall mean all of the shares of Common Stock of the Company acquired by an
      Insider prior to the IPO or privately from the Company simultaneously with
      the
      IPO; and (iv) “IPO Shares” shall mean the shares of Common Stock issued in the
      Company’s IPO.

    

    

 

    [Signature
      page follows]

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    
      	 	 	 
	 	JASON
              LUSTIG 
	 
 	 
 	 
 
	 	 	/s/ Jason
              Lustig
	 	
              
Signature
	 	 

    

     

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    Exhibit
      A

     

    Jason
      Lustig has been a member of our Board of Directors since November 2006. Since
      1989, Mr. Lustig has been a prosecuting attorney for the Los Angeles County
      District Attorney’s Office. Since 1989, Mr. Lustig has also served as Secretary
      of Magnum Motion Pictures, Inc., a privately-held motion picture production
      company with offices in New York and Los Angeles. Mr. Lustig received a B.A.
      with high honors from Rutgers University where he was a member of Phi
      Beta Kappa
      and a
      J.D. cum
      laude
      from
      Boston University School of Law.

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