DNS not functioning properly

I have a home office connected via VPN through two Watchguard SOHO 6 appliances.  The office has 2003 Exchange running.  And I am running XP with Office 2003.  I want to use Outlook to connect and retrieve my email.  This was working a for several weeks and then it stopped.  Don't know why!

I can ping the IP address of the server as well as access the drives as long as I use the IP.  Something is wrong with DNS I'm assuming.  How can I track it down?
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1) Check what your DNS Servers are when you connect through the VPN(  It's possible you don't use the DNS of the local host when connected via vpn, and therein lies your problem)

2) Creat a host entyr on your local pc in the LMHOST file, which has an entry for your Email server.


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