If you always intend to deploy within your organization, and license windows with KMS, is there ever a reason not to include skiprearm=1 in your various unattend files?

Seems to let me get more use out of my images.

  • This is a system administration question and belongs on Server Fault. Voting to close and migrate.
    – bwDraco
    Oct 21, 2011 at 17:41

1 Answer 1


Rearming Windows allows you to reset the grace period for activation on your clients. Since you're using KMS, there is no need for a grace period since the machine will automatically activate as soon as the KMS server is found.

In fact, you absolutely should always use skiprearm=1 whenever you sysprep your images, because you are limited to three rearms.

If you attempt to rearm a fourth time, you will get an error. Thus, you can no longer make changes to this particular image and will need to start fresh. This can be a problem if you like to periodically roll updates into your OS image (like we do).

  • 1
    You can add updates to offline images with DISM. You won't need to rearm or recapture, because you do it to the offline .wim. Just food for thought.
    – MDMarra
    Feb 14, 2013 at 22:50

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