OnThePharm sees some difficulties with the technology:
There is some talk among physicians about using this service to “consolidate” health records for people. This is a phenomenally BAD idea, and I suspect these docs haven’t thought it through. The reason for this is because giving patients write access to their “official” healthcare records gives them license to remove or alter things that they don’t like, or want to tweak. Yes, I know this isn’t an official electronic repository for healthcare records right now, but as soon as a doctor treats it as such, how Microsoft bills the service becomes irrelevant.