GW Client 8.0.1 Crashed Every time an Appointment was posted.
I did PC Cleanups, Uninstalled/Reinstalled GW Client. Nothing helped.
In the Event Log was:
Event Type: Error
Event Source: Application Error
Event Category: None
Event ID: 1000
Date: 7/16/2010
Time: 1:34:14 PM
Description: Faulting application grpwise.exe, version, faulting module ole32.dll, version 5.1.2600.5512, fault address 0x00030aa4.

The Fix:
Reinstalled the NIC Driver.

Expression: Wow
Thoughts: Why would NIC Drivers affect this? The User has complained about GroupWise speed issues since the upgrade from 7.0.2 to 8.0.1
the Driver update resolved both crash and the speed issue!

Consider this if you have Client speed issues, even if NIC Stats are clean.