First, Passport is not key to Microsoft's future, because it's already a proven success. MS is only trying to broaden it's uses. Second, there are a bunch of good reasons why WE NEED Passport, and the thing Passport REALLY is. That is, a global way to identify and authenticate people on the the internet.
An example, with current software, how can a person share files with his buddies over the internet? FTP, HTTP(web server), MSN Communities(or something similar), P2P file sharing, manually sending a file via IM, and probably a few others.
The problem for all of these is that in the internet scope(many users, many of whom you don't trust) you cannot assign fine-grained permissions to allow access to those files you want to share. ie. To say that Joe only has access to this file and nothing else. This could be one application of Passport that would make it all worth it, to everyone.
I realize that FTP is sort of an exception, but to the average user, an FTP server is not viable.
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