We have about 100 users on the new system (1300 to go), some have been migrated from our previous IMAP mail server (not exchange), and some have been just switched over (new account on new domain, new mailbox, no messages migrated). We have designed and pretty much overbuilt our Exchange 2010 infrastructure in regards to actual user mailbox numbers and capacity (see configuration below).
For about the past month (pre SP1 patch) our users have been experiencing what they call spinning beach balls and major hangs in OWA when accessing folders or sending an email. Often resulting (impatience in wanting to get their work done) in the user killing Safari or Firefox and then re-opening it . Patching with SP1 has not resolved the issues. So far we see the issues on only some Mac clients, but with either browser. We had one Windows XP user that experienced similar issues, but a reconfiguration of the power management settings for the NIC resolved them. We thought the same was occuring on the Mac's but it happens on both Desktop and Laptop based Macintoshes.
Our Setup; All Server 08 R2 Enterprise running on:
Physical Server: Dell R510 (plenty of horsepower!) running MB, HT, and DAG, 6 TB of storage.
Virtual Server: VMWare vSphere 4.1 connected to equallogic SAN, Secondary MB and HT for DAG passive copy primarily.
Physical Blades (2), Dell PE 610's running CAS (in CAS Array) with WNLB
SAN certificate is deployed for CAS and MB servers.
Now, before anyone gets into the whole "running on a Mac" thing, Exchange 2010 was designed with consideration to support the OWA premium experience for Safari and Firefox. IIS which hosts OWA can support a ridiculous number of connections-far surpassing anything we would use. It almost seems like Safari or Firefox is losing the browser session, but if the user waits long enough, the spinning beach ball stops and the user can proceed. The IIS logs show no disconnects unless the user actually kills the browser app.
We really need some ideas here as we are stumped as to why we are experiencing these issues on only some clients. A couple of our users are seeing these issues up to five or six times a day. With another 1300 users to go, with 90% of them running on Macs, this is a real problem.
Any help would be greatly appreciated!