I have what appears to be a similar problem (with 2 users, out of 80): when they select "Tools - Out of Office Assistant" they get msg "The Out Of Office Assistant could not be displayed. The client operation failed." Click OK then get msg "System resources are critically low. Close some windows." (same on P2-300 with 64MB RAM, or P3-667 with 256MB RAM & 2.75GB free hard-drive space & no other programs running). Click OK & back to Outlook (it doesn't cause hang or crash).
Client: Outlook 2000 SR1 SP2, Windows 98
Server: Exchange Server 5.5 SP4, Windows 2000 SP3
Any ideas? We have recently migrated our mailboxes to a new server. Perhaps the solution used by "aultbmh" should be our next step...
Regards,
Alistair