Yes it is that easy (TFS Trial to Licensed)

We finally received the license for our primary TFS server at Notion and performed the 'upgrade'.  The process was quick and painless; this is a good thing as that is what I had understood and had been telling clients.  Simply Add/Remove programs and Change the installation of TFS.  Once of the options is to enter the license key...  And that is that!

Well - there is one other small things.  The registration process resets IIS (at least that is what it appeared to be).  So you might want to do it when you aren't in the peak of your normal development or build activities.  Enjoy!