we are running a Terminal Server Farm on Windows 2008 R2 with GroupWise 2012 SP2.

All of our users have problems when opening an attachment (PDF, DOC, XLS...) from a mail and closing the opened Application (Word, Acrobat Reader, Excel....). After closing the Application GroupWize freezes for some seconds. If you click anything in GroupWise in this time, GroupWise crashes.
You've to wait up to 10-15 seconds until you can do something in GroupWise.

Our Users are really "nerved" about this situation. This problem still exists an all of our Terminal Servers.

Any Ideas what we can do ?