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.
After Mac OS. Mac OS was based on the earlier Xerox Alto system.
Mac OS
Microsoft Windows (XP, Vista,7) and Mac (Mac OS, Apple)
A Mac or a PC running a recent operating system like Vista or Mac OS 10.5
It's a Mac Os X Lion.
I have a Mac OS X but I know Mac OS is a computer made by the brand/company, Apple.
Apple wanted to be the software, and hardware company. That way Mac OS X is built for the Mac computers.
Mac & Mac is the name of a company that manufactures a variety of both modern and traditional European furniture. The company is based in the United Kingdom.
Apple Inc.
Apple California (R)
The main OS for Mac can be found on a Mac when it is switched on. The current main OS is called Mac OS X.
The second name of Mac OS X v10.4.5 is Mac OS X v10.4 Intel.Mac OS X 10.4 was known as Mac OS X Tiger.
You cannot without erasing your hard drive and installing Mac OS 9 from scratch. Even then Mac OS 9 may not run on modern Mac hardware because Mac OS 9 needs the ROM chip to boot. Modern Mac OS X hardware uses EFI to boot the system instead of a ROM chip to boot. Mac OS X v10.0 - Mac OS X v10.4 support Mac OS 9 applications and can run them, you just need to install the Mac OS 9 compatibility program which can be found on the Mac OS X Install CD.
The oldest mac OS is System 1
Mac OS Leopard
Mac OS X 10.4 (Tiger) needs to be purchased as it is not possible to update from Mac OS X 10.2.8
Unless the disc is damaged and so needs reformatting you can run the Mac OS installer over an existing Mac OS.