This really has me stumped. I am finishing up a migration from one server to another. Current situation: 2 back-end, win2k sp2, e2k sp1 servers. One of the servers is a Compaq Proliant 3000 - this is the original server. The other server is a Compaq CL380 two-node active/passive cluster - this is the new server (dual P800, 512Mb RAM,etc). I have moved all of my mailboxes over to the CL380 and am in the process of rehoming public folders, etc. so I can remove the first server.
Everything has gone fairly smooth as far as bringing the new cluster up and moving mailboxes over. However, recently, like around the time the mailboxes were moved over to the new server, the performance of our Outlook clients has gone down the tubes. It will sometimes take approx. 5 seconds to switch between folders in the folder list, or to open up an email. This behavior is very random - sometimes you can change folders instantly, sometimes it takes a while. I use Office XP and a window will pop up telling me that information is being requested from the Exchange Server with a progress bar, for example. Most other users use Outlook 2000 and experience the same performance problems except they don't receive the xp pop up window of course. We have about 300 users (all local), operate in a switched environment with three network segments (192.168.3.x, 4.x, 7.x). It doesn't seem to matter which segments you are on. Other network performance, such as browsing or connecting to network drives is great - no problems! Performance monitor shows that pages/sec is spiking out at over 100 quite frequently. Where should I start with this? List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
