8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): September 11, 2007

AUTHENTIDATE HOLDING CORP.

(Exact name of registrant as specified in its charter)

COMMISSION FILE NUMBER: 0-20190

DELAWARE	14-1673067
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Connell Corporate Center

300 Connell Drive, 5^th Floor

Berkeley Heights, New Jersey 07922

(Address and zip code of principal executive offices)

(908) 787-1700

(Registrant’s telephone number, including area code

CHECK THE APPROPRIATE BOX BELOW IF THE FORM 8-K FILING IS INTENDED TO SIMULTANEOUSLY SATISFY THE FILING OBLIGATION OF THE REGISTRANT UNDER ANY OF THE FOLLOWING PROVISIONS:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01 REGULATION FD

On September 11, 2007, Authentidate Holding Corp. issued a press release announcing that it has been in negotiations with a private company concerning a potential business combination. A copy of the press release is attached hereto as Exhibit 99.1.

The information contained herein and in the accompanying exhibits is being furnished pursuant to “Item 7.01 Regulation FD.” The information contained herein and in the accompanying exhibits shall not be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference to such filing. The information in this report, including the exhibits hereto, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended.

Item 9.01 FINCANCIAL STATEMENTS AND EXHIBITS

Exhibit 99.1 Press Release dated September 11, 2007.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

AUTHENTIDATE HOLDING CORP.

By: /s/ Surendra Pai

Name: Surendra Pai

Title: President and Chief Executive Officer

Date: September 11, 2007

EXHIBIT INDEX

Exhibit Number	Description
99.1	Press Release dated September 11, 2007.

EX-99.1

Exhibit 99.1

For: Authentidate Holding Corp.   Investor Contacts: Todd Fromer / Garth Russell   KCSA Worldwide 212-896-1215 / 212-896-1250 tfromer@kcsa.com / grussell@kcsa.com Media Contacts: Shelley Pfaendler / Erika Kay   KCSA Worldwide 212-896-1248 / 212-896-1208 spfaendler@kcsa.com / ekay@kcsa.com

AUTHENTIDATE ENGAGED IN

NEGOTIATIONS FOR A POTENTIAL BUSINESS COMBINATION

BERKELEY HEIGHTS, N.J.—September 11, 2007—Authentidate Holding Corp. (Nasdaq: ADAT), a worldwide provider of software and web-based services that enable enterprises and individuals to exchange information securely and conduct trusted business transactions, today announced that it is engaged in negotiations concerning a potential business combination between the Company and a private company. The Company indicated that while discussions between representatives of the parties continue, the terms of the transaction have not been agreed upon and no letter of intent, term sheet or acquisition agreement of any kind has been executed by either party. Any potential agreement would be subject to the review and approval of the Company’s board of directors. The Company further cautioned that as a result of the foregoing uncertainties, there can be no assurance that any agreement will be executed or any transaction completed.

About Authentidate Holding Corp.

Authentidate Holding Corp. is a worldwide provider of software and web-based services that enable enterprises and individuals to exchange information securely and conduct trusted business transactions. Our offerings are targeted at enterprises and office professionals, and incorporate security technologies such as electronic signing, identity management, and content authentication to electronically facilitate secure and trusted transactions. In the United States, we also offer our proprietary and patent pending content authentication technology as a web-based service in the form of the United States Postal Service^® Electronic Postmark^®.

The company operates its business in the United States and Germany. For more information, visit the company’s website at http://www.authentidate.com.

This press release contains forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and section 21E of the Securities Act of 1934. When used in this release, the words “believe,” “anticipate,” “think,” “intend,” “plan,” “will be,” “expect,” and similar expressions identify such forward-looking statements. Such statements regarding future events and/or the future financial performance of the Company are subject to certain risks and uncertainties, which could cause actual events or the actual future results of the Company to differ materially from any forward-looking statement. Such risks and uncertainties include, among other things, the availability of any needed financing, the Company’s ability to implement its business plan for various applications of its technologies, related decisions by the USPS, the impact of competition, the management of growth, and the other risks and uncertainties that may be detailed from time to time in the Company’s reports filed with the Securities and Exchange Commission. In light of the significant risks and uncertainties inherent in the forward-looking statements included herein, the inclusion of such statements should not be regarded as a representation by the Company or any other person that the objectives and plans of the Company will be achieved.

Authentidate is a registered trademark of Authentidate Holding Corp. Inscrybe and MyInscrybe are trademarks of Authentidate Holding Corp. All other trade names are the property of their respective owners.

This document is available on the KCSA Worldwide Website at www.kcsa.com

1