Never, and I mean never, rely on Microsoft to deliver a feature, no matter how exciting or innovative, that is crucial to a product you want to ship. Ever.
And although it's not really adding to the discussion at hand, I like the fact that somebody saw fit to quote this:
"The key here, I think, is to not think of death as an end, but think of it more of a very effective way of cutting down on your expenses."
-- Woody Allen, "Love and Death"