COMPUTER SOFTWARE INNOVATIONS, INC. 1661 E. Main Street, Suite A Easley, SC 29642 July 8, 2005

Exhibit 10.1

COMPUTER SOFTWARE INNOVATIONS, INC.

1661 E. Main Street, Suite A

Easley, SC 29642

July 8, 2005

Barron Partners LP

730 Fifth Avenue, 9^th Floor

New York, New York 10019

Attention: Mr. Andrew Barron Worden

Dear Mr. Worden:

This letter is being provided to you in connection with the above-referenced Registration Rights Agreement (the “Agreement”) between Barron and CSI. The Agreement relates to the transaction (the “Transaction”) in which Barron purchased 7,217,736 shares of Series A convertible nonvoting preferred stock of CSI (the “Preferred Stock”) and two warrants (the “Warrants”) to purchase 7,217,736 shares in the aggregate of the common stock of CSI. Under Section 2.2 of the Agreement, CSI agreed to use its best efforts to cause its registration statement filed with the Securities and Exchange Commission (the “SEC”) on March 28, 2005 to be declared effective on or before June 11, 2005. Section 2.8 provides for liquidated damages to be paid by CSI to Barron in the event of our failure to cause the registration statement to be declared effective as required. As you are aware, we previously entered into a letter agreement dated June 6, 2005 (the “Extension Letter”) extending the required effective date until July 11, 2005.

We are continuing to work to amend the Transaction documents to address comments received from the SEC staff and to thereby avoid possible future delays and additional costs. However, we do not anticipate being able to finalize all of the necessary amendments prior to July 11, 2005. Accordingly, we respectfully request that Barron extend its waiver of CSI’s current obligation under Section 2.2 of the Agreement pursuant to the Extension Letter to cause the registration statement to be declared effective by July 11, 2005, as well as the payment of related liquidated damages under Section 2.8 with respect to any failure to achieve effectiveness by such date. In consideration of the waiver extension, CSI agrees with Barron that CSI shall be required to cause the registration statement to be declared effective by August 15, 2005. This waiver shall not otherwise affect Barron’s rights and CSI’s obligations under the Agreement, including the utilization of CSI’s best efforts to cause the registration statement to be declared effective with the SEC as soon as practicable and the payment of liquidated damages under Section 2.8 with respect to any future breach of such section.

If the foregoing waiver is acceptable to Barron, please so indicate by signing the attached duplicate original of this letter and returning it to me. Thank you in advance for your cooperation and attention to this matter. Please call me if you have any questions concerning the foregoing.