You don’t need to keep that old TFS server to support older versions of Visual Studio
I have recently spoken to a number of people who were under the impression that older versions of Visual Studio could not connect to TFS2010. This is not the case. So for example you do not need to keep a TFS2005 running for your VS2005 clients. Why you might ask does this question even come up? VS2010 can build any .NET 2.0 –> 4.0 project so why not upgrade all your projects to VS2010? The answer is that products such as Biztalk and SQL Business Intelligence use older versions of the Visual Studio Shell e.g. so for SQL 2008 BI you are using in effect VS/Team Explorer 2008. Though it must be said this issue is getting better currently a BI developer still ends up having to use VS 2008 (until SSDT arrives with SQL 2012) ...