Choose About this Mac from the Apple menu and check the processor.

Mac OS X 10.5 Leopard, released on October 26, 2007, was the biggest change to Mac OS X since Apple first released OS X 10.0 in March 2001. For the first time, a version of OS X was certified as Unix, and the new unified appearance makes Leopard friendlier and less confusing for users. In this video, I test OS X Leopard with many everyday tasks such as Web Browsing, Opening Programs, Multimedia, File/Document Management, and Productivity Su. Download Imovie Leopard 10.5.8 - real advice. IMovie and 3 more programs.

If it's a Core Duo Mac, click here, install the DVD, and run Software Update.

If it's a Core 2 Duo or better Mac, upgrade it as if it was a Core Duo Mac, and once done, if desired, open the Mac App Store and try downloading Yosemite. If you get told it's incompatible, go to the online Apple Store and order a download code for Lion 10.7.

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Mac OS X 10.7 and newer don't support PowerPC software such as Microsoft Office 2004. If you upgrade the OS, back up the computer first.

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Apr 7, 2015 1:53 PM