Moving a Windows 2003 Domain with Terminal Services to new ISP

I'm planning on moving to a new ISP for my domain. We currently have two T1's providing 3 Megs up and down but it's not fast enough for the local and RDP traffic. I'm considering going to a 25 or 50 meg Comcast line.

We run Terminal Services for 20 remote employees, have 35 local employees, Exchnage 2003  and run a Sonicwall TZ210 firewall.
 
Can anyone provide details on what I should do to make this a trouble free change?
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Tony GiangrecoAsked:
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jpvargassorucoConnect With a Mentor Commented:
I guess your WAN IP addresses are going to change so you need to update your external DNS
All A records
All MX records

If you can provide your public domain name I could Diagnose it and provide better support.
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