Getting the KMS count up over the initial threshold is a pain when you only have one server or one workstation to start with. Typically you need at least 5 servers or 25 client machine requesting activation before it will work.
This guy here as created a nice .exe that will trick KMS into thinking it has received all the required requests…
telnet <server ip> 25
Type Subject:This is a test, and then press ENTER two times.
Type Testing, and then press ENTER.
Press ENTER, type a period (.), and then press ENTER.