Ramana Rao was on the closing panel at Office 2.0 and put forward this question:

I asked a few vendors if they would support OpenID for login if say 25 other Office 2.0 vendors would, and I generally got a pause, and then what appeared to be qualified nodding. Well, frankly if this simple matter can’t be resolved among the open world slice-o-function vendors, or the suite newcomers, then it’s hard to imagine the harder problems of fragility being addressed either.