There's only one question worth asking about Microsoft's HealthVault.
Microsoft, what are you doing to ensure I can move all of my HealthVault data seamlessly, with no loss of any meaning or value, to Google's "HealthVault", or that of US Bank, or Dr. Frankenstein's [1] HealthVault or ... ?
Well, you get the idea.
That's it. Every other question is a meaningless distraction.
[1] I met a Dr. Frankenstein many years ago. She was a charming family physician with a good sense of humor. I have also met Microsoft - often. I have no doubt who I'd prefer to operate my family's "HealthVault".
