Will I be able to register/activate the Essentials R2 90 day evaluation that I just downloaded and installed once I purchase the license?
When you download and install Windows Server 2012 R2 Essentials Evaluation, then purchase the
license, you will be able to activate.
There is detailed information about Evaluation Versions, please refer to the following article.
Evaluation Versions and Upgrade Options for Windows Server 2012
Hope this helps.
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