Cut-over our previously flat network a year ago and implemented VLANs. We kept the servers in VLAN 98 and the users in VLAN 90 (DHCP scope all setup for WINS/DNS/, ip helper, routing via core, etc..) and everything has been fine for approx. a year now.
A month ago we implemented 2 new Exchange servers and migrated users mailboxes to them... at which point we started seeing this Microsoft message show up on SOME (not all) Outlook clients: "...retrieving data from exchange server... blah,blah" with progression bar, all of which delaying the user for several seconds... sometimes even pointing to the wrong exchange server!
Anyway, someone here took it upon himself to move him and one of the affected users back to VLAN 98 where the servers reside... and it now appears that the problem has disappeared.. ???
To me, this makes no sense... Can anyone explain how/why this would fix this problem?? And if it actually did, what WAS the problem??