Can we connect to TFS 2010 from Team explorer 2008? This is the question to most of the people who want to use TFS 2010, but, they don't have VS 2010 installed by chance. So, no need to bother. Visual studio 2008, Team explorer 2008 supports it and you can connect to 2010 TFS server. But, you need to install one package for the forward compatibility for VSTS 2008 version. You can download it here.
Visual Studio Team System 2008 Service Pack 1 Forward Compatibility Update for Team Foundation Server 2010 (Installer)
But, before you install it, make sure you have installed the VS SP1 and Team Explorer SP1.
Visual Studio SP1 and Team Explorer SP1
Before you install anything, please read the article to avoid problems.
Installation order of packages