I have lion 10.7.5 installed if i update to 10.8 will it delete everything on my macbook?

i have lion 10.7.5 installed if i update to 10.8 will it delete everything on my macbook? i would buy it in the aple store but i have some stuff on my laptop i wish wouldnt be lost so would it delete anything or would it stay the same?

If you buy the Mt. Lion installer at the AppStore it will just upgrade the system on top of your current system and not erase your documents and other files.
But nevertheless, as with any major upgrade, make sure you have a current backup of your mac, before you upgrade. And be aware, that the upgrade is quite large - several GB. So you need to be on a reliable network with a fast and stable internet connection.
Upgrade all applications to the latest versions, while you are still running Lion.
Have you checked, if all applications you need are compatible with Mt. Lion?
See App Compatibility Table - RoaringApps.

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As others have said, the answer to your question is a big YES. Formatting a drive will delete everything!
To keep your data, yet reformat the drive for optimal Mac compatibility, you will need to:
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http://support.apple.com/kb/ph5845
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I upgraded itunes since a pop up stated that I would have to upgrade it so it can recognize my iphone5's new software. I upgraded the itunes and now when I plug in the iphone its asking "set up as new iphone" will this delete everything on my phone? Also why is it forcing me to set up as a new iphone, why doesn't it recognize it like it did before I upgraded iTunes. I'm afaid I will lose all my apps, music, pictures etc. please help. thank you.

You are correct. Corrupted files are in the backup. If you've already restored the iPhone it has been erased and starting over is the way to go in order to eliminate the corrupted files.
Hope that helps

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To back up the suggestion above, here is a suggested backup strategy.
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Hello xtremejoe
I find that changing some settings in your syncing options will get syncing working again, like enabling Manually manage music and videos.
iTunes 11 for Windows: Set up syncing for iPod, iPhone, or iPad
http://support.apple.com/kb/PH12313
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Hi guys.
I got the all new MacBook Air 11" with Lion yesterday, and would like to sell the previous model (it was with SnowLeopard).
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Thanks!

Erase and Install OSX Snow Leopard http://support.apple.com/kb/HT3910
And yes, you need the SuperDrive for this.
Stefan

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AKapur1757 wrote:
No, I tried to download music on my phone from my laptop and whenever I try it says that my phone is using a different iTunes library ...
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Ineed simple help. Not tech jargon, please
Message was edited by: BlairMac

I replied to you on the "Is it this simple?" thread.

If you install the Mountian Lion will it delete everything off your computer

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tt2

I have lion 10.7.5 installed if i update to 10.8 will it delete everything on my macbook?

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