The PGP Desktop Encrypt and Sign plugin buttons are not shown in Outlook 2003.
This can occur when using a version of Microsoft Outlook 2003 without Service Pack 3 installed. PGP Desktop 10.x requires Office 2003 Service Pack 3 for the Encrypt and Sign buttons to work properly. To resolve this issue, download and install the service pack for Office 2003.
For more information on the Encrypt and Sign buttons available with PGP Desktop 10.x, see the following articles: