Outlook 2003 and Exchange 2000. Having problems connecting to exchange server

Just recently, a number of our users (Outlook 2003) have been having problems connecting to the exchange server (Exchange 2000). Everything was working fine till yesterday afternoon when several users couldn't send emails.

A good majority of our users can still connect and not have any issues but 6 users just lost connection to the server. We can ping the server but we can't pull nor send any emails. All users are using Dell Dimension 3100 with 512 RAM standard. We are on a branch office and is connected to the exchange server at corporate office with T1 lines. Internet connectivity to the computers with issues have no problems and no changes have been made to the firewalls either.
amorayAsked:
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David LeeCommented:
Greetings, amoray.

First thing I'd do is turn on logging so I could see what's happening.  To do that click Tools->Options->Other->Advanced Options and check the box labeled "Enable logging (troubleshooting)".  Here's a link to Microsoft page that describes more about logging: http://office.microsoft.com/en-us/assistance/HA011742661033.aspx

Cheers!
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amorayAuthor Commented:
Followed the logs to show that it's trying to connect to our Exchange server through the external IP and not the internal. Thanks. Knowing that, I installed a new DNS on our local domain server to recognize the corporate domain and did a ipconfig/flushdns on all problem PC's and everything worked!! Thanks, without that log, I wouldn't have known where to start.
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David LeeCommented:
You're welcome.  Glad I could help.
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