How to offline activate Server 2012 R2

  • Open a command prompt and install the key with slmgr -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.

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  • In a command prompt type slui 4 to activate phone system Windows activation. Without a key installed first this would not be possible.

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  • Choose region.

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  • Call the number on the instructions page and provide the installation ID.

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  • Provide the generated confirmation ID.

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