Today I migrated our Visual Studio 2008 solution to Visual Studio 2010, and I started getting the following error when I kicked off a TFS build.
“The working folder [/source] is already in use by the workspace [workspace name];[owner] on computer [tfs server].”
After some research, it turned out that I just needed to run a command to clear the workspace cache.
tf workspace /delete /server:[tfs server] [workspace name];[owner]
Not too bad. 🙂
Geek-A-Boo 
“The working folder is already in use by the workspace [workspace name];[owner] on computer [tfs server].
Geek-A-Boo” was a truly nice post, . I hope you keep creating and I am going to keep viewing!
I appreciate it -Allie
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