FORM OF SUBORDINATED PROMISSORY NOTE

Exhibit 10.7

FORM OF

SUBORDINATED PROMISSORY NOTE

FOR VALUE RECEIVED, COMPUTER SOFTWARE INNOVATIONS, INC., a Delaware corporation F/K/A VERTICALBUYER, INC. (the “Borrower”), hereby promises to pay to the order of [Former CSI Shareholder] (the “Lender”), the principal sum of Three Hundred Seventy Five Thousand Forty and No/100 Dollars ($375,040.00) , with said principal to be paid in full on or before May 10, 2006 together with interest accruing at the Prime Rate of interest as reported by Bank of America plus two percent (2%) on the unpaid principal thereof to be paid in lawful money of the United States in quarterly installments of interest commencing on April 5, 2005 and continuing on the 1st day of each quarter thereafter until May 10, 2006.

The Borrower hereby reserves and shall have the right to prepay the indebtedness evidenced by this Subordinated Promissory Note (“Note”), in whole or in part, without penalty or premium.

The Borrower hereby agrees that if at any time any sum due hereunder shall be past due and unpaid, such amount, whether principal or interest, shall bear interest from the date such payment was due until paid in full at the rate of fifteen percent (15%) per annum.

The Borrower further agrees hereby that if at any time any portion of said principal and interest shall be past due and unpaid for a period of ten (10) business days following notification thereof by the Lender, the whole amount evidenced by this Note shall, at the option of the holder thereof, become immediately due, and said holder shall have the right to institute any proceedings upon this Note and any collateral given to secure the same for the purpose of collecting said principal and interest, with costs and expenses, and of protecting any security connected herewith.

The Borrower further agrees hereby that if any part of the money due hereon be not paid when due, or if this Note be placed in the hands of an attorney for collection, or if this debt or any part thereof be collected by an attorney or by legal proceedings of any kind, a reasonable attorney’s fee besides all costs and expenses incident upon such collection, shall be added to the amount due upon this Note, and be collectible as part thereof.

Anything in this Note to the contrary notwithstanding, the indebtedness evidenced by this Note, principal and interest, shall be subordinate and junior to the extent set forth in the following paragraphs to all principal and interest of all indebtedness of the Borrower for borrowed money (except such indebtedness of the Borrower other than this Note which is subordinate or junior in any respect to other indebtedness of the Borrower (collectively, “Other Subordinated Debt”), including but not limited to that certain Subordinated Promissory Note of even date herewith payable by the Borrower in the aggregate amount of $1,875,000.00 to Barron Partners LP) whether outstanding at the date of this Note or created or incurred after the date of this Note but prior to the maturity of this Note by lapse of time, acceleration or otherwise. Such indebtedness of the Borrower to which this Note is subordinate and junior is sometimes hereinafter referred to as “Senior Debt.”

Upon maturity of any Senior Debt by lapse of time, acceleration or otherwise, then all principal of, premium, if any, and interest on, all such matured Senior Debt shall first be paid in full before any payment on account of principal or interest is made upon this Note.

In the event of any insolvency, bankruptcy, liquidation, reorganization or other similar proceedings, or any receivership proceedings in connection therewith, relative to the Borrower or its property, and in the event of any proceedings for voluntary liquidation, dissolution, or other winding up of the Borrower, whether or not involving insolvency or bankruptcy proceedings, and in the event Borrower makes any payment of principal or accrued interest on any Other Subordinated Debt which is not applied pro rata against this Note and such Other Subordinated Debt (other than payments in full of