In the New York Times today there is a major article on the health initiatives of these two tech monsters. Titled "Google and Microsoft Look to Change Health care", the article quotes Adam Bosworth(Google), John D. Halamka (Harvard Medical School) and Steve Shihadeh (Microsoft) on the initiatives.
For Google's part the author notes seeing screen shots of Google Health with its extensive health profile pages. These are now posted on an unofficial Google site. Microsoft is less forthcoming but the  purchases like Medstory, and their " Knowledge Driven Health care" give a pretty good glimpse.

Technocrati: health 2.0