The documents are Team Foundation Server Upgrade Types, How to: Upgrade from Team Foundation Server Trial Edition, and How to: Upgrade from Team Foundation Server Workgroup Edition.

Remember that Team Foundation Server (TFS) will be available for purchase on Volume Licensing Agreements after May 1st.  MSDN Premium Subscriptions will only contain a Workgroup Edition of Team Foundation Server.  It has full functionality, but is limited to 5 named users.  If you have more than 5 named users you'll need the full version of Team Foundation Server.

- Jeff O

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