When you use Novell Vibe OnPrem with GroupWise, some configuration steps are required to integrate the applications, as described in Configuring GroupWise for Use with Novell Vibe OnPrem in the GroupWise 8 Interoperability Guide:
Configuring GroupWise for Use with Novell Vibe OnPrem
Using GroupWise as the Vibe E-Mail System
Enabling GroupWise/Vibe Integration for GroupWise Windows Client Users
Accessing Your Vibe Site from the GroupWise Client