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Will I lose all of my icloud music???
is it wothr it?
MacBook Pro, Mac OS X (10.6.8), iphone 4S IOS6
Upgrading Mac OS X doesn't delete anything, but I recommend to make a backup before upgrading because it can fail and you can lose files. Apart from this, the upgrade is simple because the Mac OS X installer has got the most recent OS X version, so just start the upgrade and you don't have to do anything until the Mac OS X upgrade finishes
About Mountain Lion they claim to have 200 new features
check urself
Link :
http://www.engadget.com/2012/07/25/apple-os-x-mountain-lion-10-8-review/
upgrading to mt lion 10.7
