without install microsoft Outlook, Groupwise 6.5 can work well in Vista, after install outlook, it still works, but when you configured the outlook with or without e-mail accout. the Novell GroupWise Client will stop working. it allways show a stop working dialogue box in Windows Vista:
Novell GroupWise Client has stopped working
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available.