Troubleshoot Outlook connection issues

I am having problems with Outlook/Exchange connectivity.  

Site 1 has  6 users using Outlook 2007 on XP.  1.5 MB T1
Site 2 is where my Exchange 2003 mail server is located.  3.0 MB T1s
Both sites are connected on MPLS network.

About a month ago, site 1 users began to experience abnormal amounts of Outlook disconnect/reconnect.  They also report to have frequent problems opening attachments.  No other apparent network problems.   With one user, I have rebuilt their Outlook profile, tested cabling back to the switch, and moved user to a different switch port.  Switch is a 3Com 2924 POE switch.  It is not running the latest firmware, that is a project in the future.  We have another older 3Com switch.  I am not sure if all 6 users are on the same switch or on separate switches, I haven't verified this.

The behavior reportedly is worse for two particular users but all 6 users are experiencing issues.

I have 5 other sites that are not experiencing these issues, so it's isolated to site 1.

I believe it may be a carrier network issue.  We are in the process of changing to a new carrier network which I hope will resolve the issue.  This started about a month ago, so it hasn't always done this.

Any ideas on what to do to trace down the source of these issues?  
jackadminAsked:
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jackadminConnect With a Mentor Author Commented:
The problem seems to have been resolved after we changed our WAN provider.
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Droid_99Commented:
Have you checked for any DNS conflicts?  Or flushing the dns on the local machine, perhaps an old entry for the exchange box is listed and is causing conflicts.
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marine7275Commented:
I would definitely start by testing on a new switch.
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jackadminAuthor Commented:
Problem resolved after changing WAN providers.  No solution provided.
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