Apple just announced the rumored MobileMe online service at the WWDC 08.
This year some of the rumors we reported about are pretty head-on. The Snow Leopard turned out to be true and now MobileMe.
MobileMe stores all your data online and makes it available on any browser at me.com. The online interface is pretty similar to the email and calendar applications on the OS X.
More details on Engadget.
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