Most likely M$FT wants a say in the standards and tools -- if they can make it so MSFT software is needed to store, open, edit and otherwise use the data, they are guaranteed a steady stream of medical customers, (all of whom will be "required" to pay for software licenses, updates, etc).
Considering MSFT's track record for creating proprietary file formats and software, (and worse, their track record for taking open standards like HTML and munging it for use with MS-IE), this is something the governments of the world should make sure MSFT has no control over.
Kaiser appears to have a track record of computerization of patient records on their own --- if anything they should maybe get a seat on a regulated board of people / companies / agencies that have input into the process of creating a secure but open and public standard for medical records.
More than likely some deep-pockets company will get a 10 year (US) goverment contract to "develop an open standard" and maintain a database --- much like NetSol / Verisign did with domain registration --- then get an extension to manage it for another 5-10 years while some politicians argue who should run it. In the end, it will go to the highest or lowest bidder depending on which process the goverement uses to sell out our health records... On that note -- look at "WHOIS" and how the database is not supposed to be used commercially... I can see it now, insurance companies getting the "WHOIS (having health problens)" database to deny insurance, "WHOIS (related to who)" to see if your family history makes you a good candidate for a given procedure... etc..
Face it. The genie is out of the bottle and there is little chance of putting the cork back in.