Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Servers Finally Catch Up –
A lot of you contact us yesterday because you were having problems upgrading to IOS 5 and also Mac OSX 10.7.2. , This problem was caused due to the amount of traffic which hit the Apple servers at one time. This is looking to have been resolved and people are now able to easily upgrade to IOS 5
with out any problems.Do not just start blaming this on Apple as for a lot of you it was most likely because of your ISP (internet service provider) as they seen a massive peek in download usage as most of you were downloading 400+MB file , This cause ISP to suffer as well. If you want to take a look at the peek ISP had to cope with take a look at the image below. Everything still is not going like planned after iCloud is not connecting to emails.
If you have had any more problems please let us know Tips@MacReviews.com