Nice little app! Btw, you might want to add a check for KB2662296. I found that update to resolve the issue with connection issues with tfspreview.com in Visual Studio 2010. "Unable to Connect TFS via Visual Studio".
KB2662296 "An update for Visual Studio 2010 SP1 is available to add compatibility support for Visual Studio Team Foundation Server 2012"
It does check for that KB. It is also known as GDR March 2012 and that is what is shown, as a minor update. Could perhaps be wise to add the KB number to the information there to make it more visible.