I am testing groupwise 7, and although it installs fine through Zen, it leaves behind most the files & an entry in add/remove programs if you try to uninstall it through ZEN.

It asks you to reboot & after you do, it asks to continue the uninstall, but doesn't appear to do anything more when you click OK.

Other applications remove cleanly - I just can't get groupwise to uninstall unless I go through add/remove programs.