After migrating 4.2.1 to Win2003 I'm having some spotty problems with ViewMail. Users cannot get their voicemain via Outlook. It is an intermittant issue. It seems to effect everyone at once but not very often.
When looking at my event logs, I noticed that there are a lot of TSP port collisions relating to MWI. I changed the MWI to only use ports 31 and 32 on my primary and failover server.
I'm at a loss as to how to troubleshoot this. By the time the problem is reported to me it works again and there are no indicators in the event log.