Just testing out GWise 2012 client and server. Server upgrade went pretty straight forward, but the client continues to fail. First attempt was to deliver client down through ZEN, second attempt was to manually install. Both times, and all attempts after continue to give these errors:

Attach Object
GroupWise is not properly installed. The Attachment control component could not be initialized.
Please run GroupWise Setup, or contact your system administrator.

Click OK then:

Attach Object
Attachment control interface version does not match!

Searching the forums for a similar issue, lead to an old GWise 6.5 client issue, with no resolution.