The "Microsoft Online Services Global Criminal Compliance Handbook (U.S. Domestic Version)" (also can be found here, here, and here) outlines exactly what Microsoft will do upon police request. Here's a good summary of what's in it: The Global Criminal Compliance Handbook is a quasi-comprehensive explanatory document meant for law enforcement officials seeking access to Microsoft's stored user information. It also provides sample language for subpoenas and diagrams on how to understand server logs. I call it "quasi-comprehensive" because, at a mere 22 pages, it doesn't explore the nitty-gritty of Microsoft's systems; it's more like a data-hunting guide for dummies. When it was first leaked, Microsoft tried to scrub it from the Internet. But they quickly realized that it was futile and relented.
