EXPERT RESPONSE
It sounds to me like you're either experiencing network congestion or latency or name resolution issues. You need to spend some time trying to isolate this issue. Questions to ask include:
- Is this limited to a subset of my network or are users getting this consistently across the network?
- Is this limited to a specific time of day (i.e., mornings when lots of users are logging in)?
- Check name resolution using RPCPing (on Exchange Server CD) and confirm name resolution is working.
Once you've done all these things, feel free to write back in if you have further questions or have more details and haven't managed to narrow down the root cause.
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Expert Advice: Is it possible to run Exchange 5.5 on Windows 2000 Server?
Learning Guide: Exchange Server performance
Reference Center: Outlook tips and resources
Reference Center: Exchange 5.5 tips and resources
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