As everyone who has ever used any piece of technology knows, it evolves at a amazingly fast speed and (as an exaggerated example) it seems as if by the time you walk out of the store with your new computer there is already a newer one. Because of the fact that technology evolves so fast, there will most likely be a newer version of Mac OS X available by the time you read this.
Right now (March, 2013) Mac OS X Mountain Lion 10.8.3 is the most current version.
You can check what the most current version is by going to Apple and just looking around. You can also update to the most current version by going to the "Check For Updates..." menu item in the Apple Menu. But do note that to upgrade (say from Snow Leopard to Lion or Lion to Mountain Lion) you'll need to pay from $20 to $30 in the Mac AppStore.
That would be Mac OS X Leopard.
And the X is Roman Numerable for 10.
So its really Mac OS 10 Leopard!
The latest available version of Mac OS X is 10.8.4 (Mountain Lion)
The next version of Mac OS X is called Mavericks and will be released later in this year.
The latest version of Mac OS X is 10.6.6 (Snow Leopard).
The most current release at the time of this writing is Mac OS X 10.7.2 "Lion".
Apple Macintosh Operating System has come up with the world's fastest and most advanced desktop operating system called the Apple OS X Lion. It is available now for just $29.99.
Mac OSX 10.9.2 (Mavericks)
OS X Mountain Lion 10.8
As of December 19, 2010 latest version is Mac OS X Snow Leopard 10.6.5, Build 10H574.
iphoto '08 version 7.1.5
eBay, because it is not the latest version of Mac OS X so is no longer available in shops or from Apple.
All new Macs are supplied with the latest version of Mac OS X which is currently 10.6 Snow Leopard.
Mac OS X is the operating system used by G5 Macs. The latest version of Mac OS X that will work on a G5 is Mac OS X 10.5 (also known as Leopard).
Updating to the latest version of Mac OS X will provide you with the latest printer software. HP keeps a selection of software for various versions of Mac OS X. (See links below)
The latest version of Mac OS X is Mac OS 10.8 "Mountain Lion." It was released on July 25, 2012. Updates through April 22, 2013 have produced version 10.8.3 The latest Windows version is Windows 8, released on August 1, 2012
The latest versions are4.1 for Windows2.0 for Linux2.7 for Mac OS X
Currently the latest version of Mac OS X is 10.5.8
The latest version of Mac OS X is 10.7.2 known as Lion
Mac OS X 10.4 "Tiger" will run on a PowerPC G4/800MHz machine. It is the latest OS that Apple will support on that processor, however. At this writing (January 2010), Mac OS X 10.4.11 is the latest version of Tiger.
The latest trend in operating system is the ability to connect with most devices. These is what is known as compatibility of the operating system.