Slow network transfer on windows 2003 server network

Hi,

I've encountered a slow network transfer problem recently on my Windows 2003 server (30 users network).  There seems to be delay whenever a user transfer file to the server and sometimes it fail to transfer. It wasn't always like this so I'm suspecting the problem is cause by recent changes I made or by a virus.

Changes made recently

-migrate all user local pst to reside on the server.
-updated my antivirus
-windows udpate

Server performance seem to be normal, but I really think  something is exhausting the connections  on the server.

Other possibilities:router, switch, and nic

Please help me narrow down and fix this problem.

Thanks in advance.
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NatoMasAsked:
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NatoMasConnect With a Mentor Author Commented:
I'm going to make all the pst local again and see if the problem still exist.
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jprlopesConnect With a Mentor Commented:
Did you checked if with your AV disabled, the problem mantains?
Meanwhile, try to update the server NIC drivers, check for any strange entry on Events of Server, to dispite any misconfiguration.
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NatoMasAuthor Commented:
Thanks for responding to my post jprlopes.

No problems with my AV and my NIC driver doesn't seem to have a problem as well because the problem still exist even after using a different NIC. Also, no unusual events in eventlog.

I think my problem is that I configured and move the users' archive pst files to the server instead of keeping it local.
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NatoMasAuthor Commented:
Setting the user's archive pst files to reside on the server and mounting it to their Outlook profile cause the network traffic to bottleneck.
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