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I reinstalled my Windows Server 2008 R2 and found that I cannot active my OS with my key. Is it true this key will be invalid if I reinstalled my OS?
I'm having the same activation issue for Windows Server 2008 R2.
I just emailed microsoft about this....waiting for reply.
Send an email to Support.
http://support.microsoft.com/select/?LN=en-us&x=13&y=10&target=assistance
UPDATE:
Customer Service issued a new Key to me in Dream Spark. It took about 2 weeks.
This should work for you too!