The following is a known temporary workaround for the issue until the version/maintenance pack is released:
- Open PGP Desktop
- Click on the PGP Keys tab.
- Right click the key you want to send
- Select Send to >> Mail recipient
- Your email program will open and the key will be attached to the email.
This issue is fixed in the following release:
PGP Desktop 10.2.x
Microsoft Office Outlook.