<Page> EXHIBIT 10.5 FORM OF LETTER AGREEMENT HARBOR ACQUISITION CORPORATION/ GRAND CRU MANAGEMENT, LLC June __, 2005 Grand Cru Management, LLC One Boston Place - Suite 3630 Boston, Massachusetts 02108 Gentlemen: This letter will confirm our agreement that, commencing on the effective date ("Effective Date") of the registration statement for the initial public offering ("IPO") of the securities of Harbor Acquisition Corporation ("Company") and continuing until the consummation by the Company of a business combination (as described in the Company's IPO prospectus) Grand Cru Management, LLC shall make available to the Company certain limited administrative, technology and secretarial services, as well as the use of certain limited office space, including a conference room, as may be required by the Company from time to time, situated at Suite 3630, One Boston Place, Boston, Massachusetts (or any successor location). In exchange therefor, the Company shall pay Grand Cru Management, LLC the sum of $7,500 per month on the Effective Date and continuing monthly thereafter. Very truly yours, HARBOR ACQUISITION CORPORATION By: ---------------------------------------- Robert J. Hanks, Chief Executive Officer AGREED TO AND ACCEPTED BY: GRAND CRU MANAGEMENT, LLC By: ------------------------------- David A. R. Dullum, Manager