Windows Live ID - Platform Neutral

I know there are probably some folks who roll their eyes when Microsoft uses the term "platform-neutral":

Windows Live ID Web Authentication 1.0 SDK

Brief Description

The Windows Live™ ID Web Authentication 1.0 software development kit (SDK) gives you a platform-neutral way to bring the power of the Windows Live ID authentication service to your own Web site.

But in this case, there's some meat on them bones:

System Requirements

• Supported Operating Systems: Linux; Windows Vista; Windows XP

My guess is that in this case, you could translate that to...we're listening.

Download details: Windows Live ID Web Authentication 1.0 SDK