After upgrading TFS to version 2015 users that are on Visual Studio 2008 get the following error when opening it.
Team Foundation Error - Specified Method is not supported.
Also when you attempt to check in changed items into source control and you want to associate work items it just keeps sprinning saying requesting work item queries, it never populates with anything. I'm also unable to view builds in the Team explorer using 2008 connected to tfs2015. Also in Visual Studio if I click on Build -> Queue new build from the menu I get the error, Team Foundation Error, Specified method is not supported.
Thanks,