We just completed a 65 user migration from GroupWise 5.5 to Exchange 2003 using the Exchange Server Migration Wizard. We performed a 1 step migration using 6 migration PCs with the Groupwise 5.2.4 client. The Groupwise 5.5 client will crash the migration wizard. Each of the 6 migration PCs were running VMWare with 2 virtual machines. The total migration lasted approximately 3 hours but that was only for messages and calendar data.
The contacts were converted using the Groupwise plug-in for Outlook and were converted manually. Each Groupwise address book was migrated to it's own Outlook contact folder. This was a pain in the @$$ to say the least.
The day after the migration someone noticed that the email addresses of the converted contacts were stored incorrectly in Outlook. So the day after the conversion we needed to run an Outlook Export/Import on all the already migrated contacts. This seemed to fix the problem but there might have been another way to do this.
When we opened Outlook for the first time for each migrated user, we received a strange Schedule+ dialog box that talked about server side information being available, etc. One option was to import this information or delete it. If you import this information the end result will be duplicate calendar items which was another issue that we had.
The other issue we encountered was the fact that staff members stored other staff members in the address books. These converted entries still pointed to a Groupwise address. The customer wanted these entries to be corrected rather than deleting them and using the GAL for staff members. This was done using an Outlook script.
I don't believe tasks were converted during this migration either. The Groupwise tasks might have been converted into Outlook calendar items but I'm not sure about this.
Even with all these pitfalls, we migrated this customer to Windows 2003/Exchange 2003 from Novell 5.x/Groupwise 5.5 in approximately 2.5 days using 4 people. This included setting up Active Directory, Symantec AV for Exchange, Veritas BackupExec, installing Outlook XP on 65 machines (most were Win 98), removing the Novell and GroupWise client, logon scripts, etc...
Hope this information if helpful.
Craig Huck
Integrita Systems