PGP Viewer allows users who do not have Email Messaging enabled to decrypt PGP encrypted messages.
After opening PGP Viewer, the user drags and drops the encrypted message from the Outlook Inbox to the PGP Viewer window. You can even drag and drop .pgp files from the machine to PGP Viewer to decrypt.
However, this functionality does not work with 64-bit Outlook or with Microsoft Office Professional Plus 2013 and above using Click-to-Run.
An error message similar to the following is displayed where the Subject of the message is Test:
PGP Viewer was unable to open "Test.msg".
Error: Not a mail message
To determine whether Outlook is using Click-to-Run, please refer to this article. For example, if this registry key has a REG_SZ value of en-us then you are running Outlook Click-to-Run:
Upgrade to release 10.5.1 or above.
Starting with release 10.5.1, PGP Viewer is compatible with 64-bit versions of Outlook and with Click-to-Run versions of Microsoft Office Professional Plus 2013 or later.
If you cannot upgrade, please use one of the workarounds below to decrypt messages using PGP Viewer:
Workaround 1: If the encrypted message has an attachment named
Message.pgp it is a PGP/MIME encoded message. Drag and drop just the Message.pgp attachment to PGP Viewer in order to decrypt it.
Workaround 2: If dragging and dropping the
Message.pgp file does not work, save the
Message.pgp file to your computer and from there, drag and drop it to PGP Viewer to view the message.
Workaround 3: If the body of the encrypted message begins and ends with the following text then it is encrypted with PGP Partitioned encoding:
-----BEGIN PGP MESSAGE-----
-----END PGP MESSAGE-----
To decrypt a PGP Partitioned message: