Exchange going really slow - outlook exclamation mark!

We have exchange 2003 running on server 2003 R2 across two sites, one domain. Was running fine until last week when people started getting "outlook is trying to contact exchange server" exlamation error. CPU was fine as was memory. We defraged just in case overnight but still no difference.
Then, by coincidence, we had to reboot our DC for the site. (which is also the GC). Immediately exchange recovered and was lighting fast. Since then we still get slowdowns, but these are immediatly resolved by rebooting the DC. Error logs don't seem to show anything untoward and now at a loss to explain/fix it..................
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davelongmanAsked:
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davelongmanConnect With a Mentor Author Commented:
Thanks greesh hem, we didn't see packet loss so ran exchange tech assistant. This has shown RPC delays and also a disk bottleneck occuring (we believe due to MAPI clients increasing over time). I am going to install a new scsi drive and move the transaction logs over so hopefully this will resolve the situation. I am confused as to why booting the GC improved matters, but I think it may be because exchange then temporarily stops the processing that was hammering the disk access and then once it found the backup GC it started to slow down again.

Thanks for your help in at least proving it local to the exchange server itself, even though initial diags looked like a DC/AD problem.
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greesh_hemConnect With a Mentor Commented:
Try to run a DCDiag on the exchange server with the switch

DCdiag /s:Servername

where Servername would be the NETBios name of your domain controller and try to look at the diagnostics to see if you find any failures.

Also try to take a network trace since there is a good possibility that the network packets may be getting dropped.
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davelongmanAuthor Commented:
Dcdiag passed all tests - file attached.

What's the best way to take a network trace please?

Thanks,
dcdiag.txt
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greesh_hemConnect With a Mentor Commented:
Install Netmon on one of the Outlook client machine and then run it from there.

http://blogs.technet.com/netmon/
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