Shut down Windows Server on power failure without vendor-specific third-party software

Touch choice #1: You could run a GE supported version of Windows in a small VM, and have it signal the host.

Touch choice #2: If the GE NetPro provides serial signaling in addition to network, it probably wouldn't be too hard to adapt a cable and run the Windows 2008 release of APCUPSD, an open source project.

GE must be slowly backing out of this market, since its web page still sells and advertises both the H/W and S/W but does not support WS2008.

In most cases, for smaller deployments, the UPS will connect to the server via USB or the UPS will be ethernet-ready.

Anywho, most major UPS providers have these awesome little cheat sheets:

http://www.apc.com/tools/ups_selector/pso/zones/

Go there, and it's got a plethora of devices (your particular server line included, probably) for you to choose from, so you can tell it exactly what you're planning to keep running when the power goes, and it'll scale a couple of models for you based on that information. Very handy if you're not too power savvy, like myself.