I would have to say Mac OS X 10.4 Tiger , Or Leopard
Mac OS X Lion is version 10.7
The Mac's operating system was originally known as the System Software. It later became known as Mac OS followed by a version number - Mac OS 7, Mac OS 8 etc. The current 10th version is known as Mac OS X.
[A version of Mac OS X comes with every Mac. You must pay for any upgrades to a newer version] Not if you use torrents(:
No.
The current version of Apple's operating system is Mac OS X 10.7 (Lion).
You can install the Mac version of LimeWire on Mac OS X. (See links below)
Adobe Photoshop version 7 was the first version for Mac OS X and was released in 2002.
Apple Inc. owns, writes, publishes, and distributes Mac OS X 10.6 "Snow Leopard" (the current version of Mac OS X, as of January 2010), along with every prior version of Mac OS since its introduction in 1984.
As of December 19, 2010 latest version is Mac OS X Snow Leopard 10.6.5, Build 10H574.
If the computer is running Mac OS Lion or higher we recommend the 2011 version.
Mac OS X 10.5 (Leopard)
Click the apple icon on the dock and click on "About this Mac" and your Mac will tell you the version number.