It is my first time updating an operating system on my mac.will lion delete my files off my hard drive when I upgrade to lion?

I reccently bought my imac around christmas of 2009, and this is the first time I have ever upgraded the operating system on my mac. will upgrading to lion completely wipe out all the files and data on my hard drive?

No, it won't. But you should make a backup of your files, document your settings and check application compatibility.

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