I mistakenly installed Windows Server 2012 Evaluation instead of Windows Server 2012 R2 Evaluation. Now my client just bought the license key for 2012 R2, and I am not sure how to proceed. Is it possible to insert the retail CD that has the key, and perform an upgrade from Server 2012 Evaluation to Server 2012 R2 Retail? This article explains that although it could be possible, it is not correct.
Anybody have any experience with this? It would be very preferable to not have to perform a complete reinstall.