Start with this article which talks about your issue:
KMS count not incrementing after running sysprep.
929829 The KMS current count does not increase when you add new Windows
Vista-based client computers to the network
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|>From: Motor Wu <email@example.com>
|>Subject: Re: How to do sysprep to make a image for my users and maintain
the count on KMS server ?
|>Date: Sat, 17 Mar 2007 07:01:12 +0800
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|>Path: TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSF TNGP03.phx.gbl
|>Thanks your reply, the 25 minimum is ok for us, I can spend 2 day to
|>build up to 25 times of reformat and install Vista. But what we
|>concern is that when we deploy Vista and make a image for all users in
|>our office, the users Vista won't contriute count to KMS, then we
|>should maintain the count manually...
|>On Fri, 16 Mar 2007 10:33:45 -0400, Steve Maser <firstname.lastname@example.org>
|>>In article <email@example.com>, Motor Wu
|>>> Dear all,
|>>> We just build the KMS server(already activated) on Windows
|>>> 2003 and want to make
|>>> it can activate the Vista clients. As Microsoft website said, we need
|>>> 25 client connect to KMS to request activation then the KMS can
|>>> activate all clients.
|>>> We just a testing lab, so I just use one PC to format and
|>>> install Vista then activate it to increase the count. I don't want to
|>>> install and insatll 25 times to make KMS count to 25. So I sysprep
|>>> (sysprep /generalize)the Vista as Microsoft website said to change its
|>>> After sysprep, I try to connect to KMS server to increase the
|>>> count, but it didn't increase, remain the same. I also try the slmgr
|>>> -rearm to reset the CMID, it doesn't work.
|>>> I can reformat again and install 25 times to increase count to
|>>> 25. But after testing period, all our users will use the same vista
|>>> image (after sysprep), the KMS will fail after 30 days, because it
|>>> does not increase any more!
|>>> How to do sysprep to make a image for my users and maintain
|>>> the count on KMS server ? Thanks.
|>>I don't maintain the KMS server here, but in talking to our admins that
|>>do this -- just reloading an image didn't increment the count on the
|>>KMS server to get to 25.
|>>We had to use 25 *unique installs* of Vista to get over 25. This
|>>either meant reformatting a computer 25 times, or loading vista on 25
|>>The 25 install limitation is pretty dumb, IMO and caused a lot of
|>>confusion when they tried to add another KMS server to a "pool" and
|>>people's activations weren't happening when they hit that new machine
|>>in the pool for a while.
|>>Why 25? Why not 10? Why not 5? Why *any* minimum? Sheesh...