OS 10.6.8 is Lion, Snow Leopard or Mountain Lion ?

10.6.8 is Snow Leopard. If the computer's incompatible with Mavericks but has a Core 2 Duo(not Core Duo) CPU and at least 2GB of RAM, the next step is to buy a download code for Lion from the online Apple Store.

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Snow Leoparad 10.6.8 is a really nice OS.

Click on the Apple Menu's, "About This Mac."

Snow Leopard is 10.6.8

Lion is 10.7.5

Mountain Lion is 10.8.5

Mavericks is 10.9.1

http://en.wikipedia.org/wiki/Mac_OS_X

This shows more history and is actually a great article to read.

Using the above information, go to the  menu/About this Mac to see what version you are using.