Summary of AUTHENTIDATE HOLDING CORP

Item 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On June 12, 2008, Authentidate Holding Corp. (the "Company") announced that effective June 13, 2008, the listing of the Company's common stock will be transferred from the NASDAQ Global Market to the NASDAQ Capital Market. As previously announced on December 18, 2007, the Company received a letter from the NASDAQ Stock Market advising that the Company did not meet the minimum $1.00 per share bid price requirement for continued inclusion on the NASDAQ Global Market pursuant to NASDAQ Marketplace Rule 4450(a)(5). The letter stated that the Company had until June 16, 2008 to regain compliance and provided an option for the Company to transfer the listing of its common stock to the NASDAQ Capital Market. Upon such transfer, the Company would be afforded an additional 180 calendar days to comply with the minimum bid price requirement while listed on the NASDAQ Capital Market.

Prior to June 11, 2008, the Company submitted a transfer application with NASDAQ to transfer listing of its common stock to the NASDAQ Capital Market. On June 11, 2008, NASDAQ approved the transfer application, and the Company will be afforded an additional compliance period of 180 calendar days, or until December 12, 2008, to comply with the minimum bid price requirement of the NASDAQ Capital Market.

The Company's common stock will continue to trade under the symbol "ADAT." The NASDAQ Stock Market operates both the NASDAQ Global Market and the NASDAQ Capital Market. All companies listed on the NASDAQ Capital Market must meet certain financial requirements and adhere to similar corporate governance standards as companies listed on the NASDAQ Global Market. On June 12, 2008, the Company issued the press release attached to this Current Report as Exhibit 99.1.