default KMS key that comes with the OS when you first installed it (not a
manually entered one, OEM or retail key ...)
Assuming your KMS was installed using your unique KMS key, and it properly
generated its own DNS entry.
google: slmgr windows 7 cmid
The KMS current count does not increase when you add new Windows Vista or
Windows 7-based client computers to the network
http://support.microsoft.com/kb/929829
Cut to the chase; to avoid re-sysprepping each machine in order to
generalize and generate a unique Client Machine ID or CMID on each so that
the KMS will recognize each as separate from other machines, instead from an
elevated cmd prompt, type:
slmgr.vbs -rearm
then:
slmgr.vbs -ato
When the KMS recognizes its 25th unique machine, it will pop. The first 24
clients will update their status locally at their next restart.
Or you could install/register 5 unique server OSes installed with the
default KMS key.
You will NOT see the CMID of an unactivated OS that is using the
default-installed KMS key when you use "slmgr.vbs -dlv" until after it has
been activated by your KMS.
Once your KMS is spitting out activations properly, you will notice that the
re-arm count on your KMS-activated OSes has been set to 1, even if it was 4
before you ran the commands above.