Currently Outlook 2102 is not listed under supported or tested email client for PGP Desktop 10.x versions.
PGP Desktop Client 10.5
“A Feature Request has been submitted for to add Outlook 2102 under supported or tested email client for PGP Desktop 10.x versions.
Symantec Enterprise Division is committed to product quality and satisfied customers. Technical Support filed a Feature Request to add the functionality listed above. This Feature Request is currently being considered by Symantec to be addressed in a forthcoming version of the product.
There is no guaranteed date for this request from the Encryption Product Management team, or the Encryption Engineering team at this time. Please be sure to refer back to this article periodically as any changes to the status of the request will be reflected here.
To have your organization added to the list of companies that desire this Feature Request, or to follow-up on this request, please Symantec Encryption Support.”