Extend the Activation Grace Period of a Windows Operating System

Problem:
You are evaluating or testing a Windows Operating System and need to extend the activation grace period to complete your evaluation or testing.

Solution:
Extend or rearm the evaluation period. This process must be followed before the activation countdown reaches 0:

act_8_days

Right click “Command Prompt” and select “Run as administrator”:

cmd_admin

Navigate to the C:\Windows\System32 folder and execute the following command.

slmgr

Most documentation on this procedure references -rearm which works on Windows Vista and 7 but sometimes generates an error on certain Windows 2008 installations.

Restart your computer and verify the process worked:

act_30_days

Use the following command to verify the amount of time remaining before your evaluation period expires:

grace

For more information:
http://support.microsoft.com/kb/948472

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