What are the system requirements to use the Plug-In for Microsoft® Office?

• Operating System: Windows 2000 or greater (excludes Windows Millennium Edition)
• Internet Explorer: version 5 or greater
• Microsoft Office: 2000, 2003, 2007 or XP

How do I sign up?

Go to www.uspsepm.com and click on [SIGN UP]. Follow the 1-2-3 steps allowing you to create an account, buy a USPS EPM block and download the software.

Where can I download the software?

You may go to http://www.authentidate.com/index.php/content/view/75/455/ to download the software.

How much does it cost?

Priced per transaction, on a volume basis. You may visit the pricing page at: http://www.authentidate.com/index.php/content/view/369/628/.

Do I have to purchase a digital certificate to use the EPM® Service?

No. The USPS EPM Service will issue a per-usage signing certificate when you decide to sign using the Username and Password option. This certificate is linked to the account that you created when you signed up.

What are the requirements for digital certificates that can be used with the EPM® Service?

Digital certificates that can be used with the Microsoft® Office Plug-in must have the following attributes:

• Version- X.509 version 3
• Public Key Length- 1024 bits (minimum)
• Key Usage- digital signature
• Digital Signature certificate