File-sharing server - As a server, the system can share files using only the Apple Filing Protocol (over TCP/IP), HTTP, SSH, and FTP.

It cannot use SMB to connect to Windows or Samba servers.

File-sharing client - The system can only use TCP/IP, not AppleTalk, to connect to servers sharing the Apple Filing Protocol.

Protected memory - memory protection so that if an application corrupts its memory, the memory of other applications will not be corrupted.Sherlock - desktop and web search engine.Built on Darwin, a Unix-like operating system.PDF Support (create PDFs from any application).Full preemptive multitasking support, a long-awaited feature on the Mac.TextEdit - new on-board word processor, replacement to SimpleText.Mac OS had previously had the distinction of being one of the few operating systems with no command line interface at all. Terminal - the Terminal was a feature that allowed access to Mac OS X's underpinnings, namely the Unix core.OSFMK 7.3 - the Open Source Foundation Mach kernel was part of the XNU kernel for Mac OS X, and was one of the largest changes from a technical standpoint in Mac OS X.

Dock - the Dock was a new way of organizing one's Mac OS X applications on a user interface, and a change from the classic method of Application launching in previous Mac OS systems.1,500 MB (800 MB for the minimal install).Supported Computers: Power Macintosh G3 Beige, G3 B&W, G4, G4 Cube, iMac, PowerBook G3, PowerBook G4, iBook.Additionally the new operating system required more hard drive space, causing longer boot times. In addition, processor upgrade cards, which were quite popular for obsolete pre-G3 Power Macintosh computers, were not supported (and never officially have been, but can be made to work through third-party utility programs). The system requirements for Mac OS X 10.0 were not well received by the Macintosh community, as at the time the amount of RAM standard with Macintosh computers was 64 megabytes (MB), while the Mac OS X 10.0 requirements called for 128 MB of RAM. Unlike releases of Mac OS X 10.2 to 10.8, the cat-themed code name was not used in marketing the new operating system.

Cheetah proved to be a rocky start to the Mac OS X line, plagued with missing features and performance issues, although it was praised for still being a good start to an operating system still in its infancy, in terms of completeness and overall operating system stability. Mac OS X introduced the new Darwin Unix-like core and a completely new system of memory management. It introduced a brand new code base completely separate from Mac OS 9's, as well as all previous Apple operating systems. Mac OS X 10.0 was a radical departure from the classic Mac OS and was Apple’s long-awaited answer for a next generation Macintosh operating system.

Mac os x 10.0 desktop