IOS5: took a long time to download, then when I tried to install, my iPad wouldn't just upgrade the IOS it had to be restored - so it said - then it said it was unable to restore. Finally on the third try it restored, took a long time, had to make some new folders. While doing this I called Apple Care, the person I talked to said that I was the first person he'd talked to that actually was able to install, so much traffic that people are having many problems. I would imagine that there will be tweaks to the system. He advised waiting a few days enforce upgrading my wife's iPhone.
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