HT1338 i have os x 10.5.8 and i need to update.

my imac running os x 10.5.8 will not work with my iphone 5. i cant seem to update.  do i need to purchase software?

The first step is to purchase Snow Leopard - if you can run it:
Requirements for OS X 10.6 'Snow Leopard'
http://support.apple.com/kb/SP575
Whilst Apple have withdrawn Snow Leopard from download, you can still get it from Apple by calling 1-800-MY-APPLE (if you are in the USA) and they will supply the SL DVD for $30.  You can also purchase the code to use to download Lion from the same number.
If you are outside the US call your national Apple Helpline:
http://support.apple.com/kb/HE57
If you're in the UK, use this number: 0871 508 4400
When you have installed it, run Software Update to download and install the latest updates for Snow Leopard.
Then, if you can run it, upgrade to Mountain Lion:
Requirements for Mountain Lion:
http://www.apple.com/osx/specs/

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