Ran into this last night where one of my team members was trying to connect over the VPN and couldn’t resolve the team server name, and couldn’t do anything with the team server settings in Visual Studio as a result.  The problem with resolution is a DNS thing on the VPN and not really important, what needed to happen though was that he needed to be able to change the server from FQDN to NetBIOS name, but couldn’t do it in the UI because apparrently if you HAVE a server defined it will try to connect to that server anytime you try to go do anything team related.  And since I haven’t found a “manage servers” dialog that you can get to without going through the “team project” dialogs…hosed.

Turns out it’s pretty simple to change the server settings outside of VS2005.  documents and settings\user\local settings\application data\microsoft\team foundation\1.0\cache\servermap.xml and find your server connection strings in there, modify them accordingly, restart VS2005 and your new settings are in place.