This part of Troubleshooting 1: Error Messages helps you resolve GroupWise Windows client, Remote client, and Linux/Mac client error messages.
Section 18.0, Windows Client Error Messages
Section 19.0, Remote Mode Windows Client Error Messages
Section 20.0, Linux/Mac Client Error Messages
Other sources of assistance include:
Novell Support and Knowledgebase
GroupWise 8 Support Forums
GroupWise Cool Solutions