Receiving error 0xC004F015 or 0xC004F074 in new KMS setup

Greetings. I am setting up a computer lab with 30 Mac's running Bootcamp and Windows 7 x64 Professional. I am attempting to set them up to use KMS, and have used the ISO downloaded from the licensing service center to install Windows on the systems.

I have deployed a virtual Windows Server 2008 Enterprise Edition server to serve as the KMS host.

My understanding is that I need to do slmgr -ipk <windows 7 kms key> on the host as the first step. This does not work. When I do this, I receive the error message 0xC004F015. On one forum post I read, it says that if I want to use a Server 2008 system as my KMS host, I must use slmgr -ipk <server 2008 kms key>. Doing this succeeds in activation on the KMS host, and at this point the clients produce the error 0xC004F074 when their activation is attempted. Yes, I have tried the activation on all 30 systems.

Can someone confirm which KMS key I am supposed to run wtih slmgr -ipk on the server 2008 KMS host?

If I am correct that the Windows 7 KMS key is required, can anyone explain why I am receiving this rather vague error message (0xC004F015)?

If I am incorrect, and the Windows Server 2008 KMS key is required, where do I put the Windows 7 KMS key? Surely I have to input it somewhere, and it also does not make sense that to use the KMS service on Windows 7 clients that I would be required to have a Server 2008 KMS key. For these reasons I assume I am supposed to install the Windows 7 KMS key on the Server 2008 KMS host.

Edit: I have seen forum posts suggesting that part of the problem may be the KMS client version being different on the systems. I can confirm that different versions are present on the Windows 7 systems and the Server 2008 systems. The version reported by slmgr -dlv on the Windows 7 systems is 6.1.7601.17514. The version reported by slmgr -dlv on the Server 2008 systems is 6.0.6002.18112.

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