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Helpful answers
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Oct 9, 2012 10:03 PM in response to Golfer-x20by mende1,Welcome to the Apple Support Communities
You won't lose files
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Oct 10, 2012 11:06 AM in response to Golfer-x20by baltwo,Only if you elect to Erase & Install. Use either Archive & Install or Upgrade. Details in http://support.apple.com/kb/HT1710