FOR IMMEDIATE RELEASE Contact: Media Relations 202-268-2155 October 17, 2003 Release No. 076 www.usps.com POSTAL SERVICE EPM DIGITALLY PROTECTS MICROSOFT® DOCUMENTS Washington, DC -- Continuing its historic role as a trusted third party, the U.S. Postal Service today announced the availability of the USPS Electronic Postmark (EPM) Extension for Microsoft Office, thereby giving users tamper detection and date/time stamping of electronic documents and files. The USPS EPM Extension for Microsoft Office "offers significant value by providing a level of security and trust to electronic correspondence," noted Nicholas Barranca, USPS Vice President, Product Development. "Now that the USPS Electronic Postmark can be used so effortlessly within the Microsoft Office environment, we believe more users will be able to realize the benefits of the USPS Electronic Postmark." The USPS EPM Extension for Microsoft Office requires the user to digitally sign a document when applying a USPS Electronic Postmark within Microsoft Office XP and Microsoft Office 2003. This combination of technologies provides an integrated set of capabilities, including. - Digital signing of a Microsoft Office Word document using digital certificates; - Electronic content sealing and time/date stamping with the USPS EPM; - Subsequent verification of an MS Word document's validity, authenticity and integrity. "Microsoft is excited to offer our customers a solution for conducting business securely online with the United States Postal Service," said Gytis Barzdukas, director, Information Worker Product Management Group at Microsoft Corp. "Users can easily take advantage of USPS EPM service through Microsoft Office Word 2003, an application that they already recognize and are comfortable using." The USPS EPM Extension for Microsoft Office can be downloaded from www.uspsepm.com/epm/epm_office_ext/ . The USPS EPM Extension for Microsoft Office software was co-developed by AuthentiDate, Inc. (NasdaqNM: ADAT) and Microsoft Corp (NasdaqNM:MSFT). - 30 -