http://bugs.winehq.org/show_bug.cgi?id=30517
--- Comment #5 from Gábor Katona katonag@gmail.com 2012-04-25 08:22:00 CDT --- I think the wine side of the bug is, that the app appears on all activities. Other MSWindows apps appear only on the activity they are started from. Somehow the office2007 window doesn't honor the setting which other apps (Windows apps) accept.
I think it is a wine problem. I wouldn't think KDE tries to set different things for Office apps.