Mac OS 9

Mac OS 9 is an operating system that was designed and developed by Apple in 1999 alongside Apple’s personal computers. The system has been released on October 23, 1999, and was available for $99 or was preinstalled on currently sold computers.

Mac OS 9 was featuring more than 50 new features and 9 internet power tools. This release was focused mainly on Sherlock improvements but included a series of bug fixes and new features such as protected memory, pre-emptive multitasking, multiple users support, a new Energy Saver Control Panel, hibernate function, and many more.

On January 9, 2001, this Mac OS has been replaced by a newer version of Mac OS 9.1.

Today Mac OS 9 is 23 years old!

Mac OS 9.0.4
Source: – Mac OS 9.0.4

Mac OS 9 General Information

ReleasedOctober 23, 1999
Original Price$99
System RequirementsPowerPC processor
250 MB of hard disk space
Order NumberM7401LL/A


VersionRelease Date
Mac OS 9.0October 23, 1999
Mac OS 9.0.1Unreleased
Mac OS 9.0.2February 16, 2000
Mac OS 9.0.3March 24, 2000
Mac OS 9.0.4April 4, 2000

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