Vista Upgrade Advisor across LAN

I currently work in a SBS2003 environment with around 55 client PC's
running a mixture of WinXP Pro and Vista Business SP1.

Does anyone know of a product or how to get the Vista Upgrade Advisor
to check the LAN, identify the PC's running WinXP and report back if
they're suitable upgrade candidates?

If I sat in the same building as the clients then I'd do a manual check
but I don't and can't.

Thanks in advance for your assistance.


--
ewideboy