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I have a Windows Server R2 Standard server. I put in the correct key and it activates fine. In 30 days, however, the server asks me to activate the license again. How can I fix this? Call Microsoft? Thanks.

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Are you restoring this server from a snapshot at all? Is it a MAK? Does the hardware of the server ever change? –  MDMarra Sep 18 '12 at 15:08
"Call Microsoft" is pretty much the correct answer. –  ThatGraemeGuy Sep 18 '12 at 15:40
Checking with slmgr -dli or slmgr -dlv first won't hurt, though. –  Ansgar Wiechers Sep 18 '12 at 18:34

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