Yes, here you have how to do it
http://blogs.msdn.com/vstsue/articles/583466.aspx

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Luis Fraile
MCSD.NET
> Can the eval copy of Team foundation server be fixed in place to be a real
> copy without re-installing? We have it setup and it took quite a bit of time
> to get it all working. Then we found out the copy we had was only the
> workgroup edition. Can this be updated in place to the full version?
>
> Thanks
vampiretap - 15 May 2006 20:15 GMT
Thanks. That is exactly what I needed.
> Yes, here you have how to do it
> http://blogs.msdn.com/vstsue/articles/583466.aspx
[quoted text clipped - 5 lines]
> >
> > Thanks