I have activated windows server 2012r2 and after the Tuesday morning update the server states that I need to activate again.Microsoft support want's $500.00 to fix the problem.  There has to be a way to deactivate and then re-activate.

If you have valid key, then it should not be a problem. Have a look at this : http://its.virginia.edu/software/mslicenses/activate.html

You could also try slmgr /ato from an admin cmd prompt

https://technet.microsoft.com/en-us/library/dn502540.aspx

Hi,

Any update about the issue?

Regards.