Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. It was first introduced in 1984 and has been pre-installed on almost every Macintosh computer sold. The original system was partially based on earlier Apple operating systems and concepts from Xerox PARC. Mac OS 9 was the final major release of the "Classic" Mac OS line, introducing features like Sherlock 2 for internet searching and iTools integration. Mac OS X improved on this and is a Unix-based graphical operating system, the 10th major version of the Mac operating system. It has advantages like being easy to use, virus free, and allowing Windows compatibility through Boot Camp or Parallels.

2. Mac OS
 series of graphical user interface-based operating
systems
 developed by Apple Inc.
 first introduced in January 24, 1984 with the original
Macintosh,
 usually referred to simply as the System software.

3.  has been pre-installed on almost every Macintosh
computer sold.
 The operating system is also sold separately on the
Mac App Store for $29.99.
 also sold on a USB flash drive for $69.00. (Mac OS X
Lion only.)
 The original Macintosh system software was partially
based on the Lisa OS,
 released by Apple for the Lisa computer in 1983
 it also used concepts from
 Xerox PARC
 Xerox Alto

4. What are the advantages and
disadvantages of Mac OS?
Advantages
Disadvantages
 Security
 Price
 Reliability
 Ease of Use
 Gaming
 Integration With
Apple and Other
Products  Fewer Software Options
 Mac OS Can Run
Windows at the Same
Time

6. Mac OS 9
 the final major release of Apple's "Classic" Mac OS.
 Introduced on October 23, 1999,
 "The Best Internet Operating System Ever,"[
 highlighting Sherlock 2's Internet search capabilities,
 integration with Apple's free online services known
as iTools
 improved Open Transport networking.

7.  lacks protected memory and full pre-emptive
multitasking,
 lasting improvements include the introduction of an
automated Software Update engine and support
for multiple users.
 discontinued development of Mac OS 9 in 2002.
 At the 2002 World Wide Developers Conference,
Steve Jobs began his keynote address by staging a
mock funeral for OS 9.

8. FEATURES
 Apple billed Mac OS 9 as including "50 New Features"
and heavily marketed its Sherlock 2 software,
 which introduced a 'channels' feature for searching
different online resources and introduced
a QuickTime-like metallic appearance.
 Mac OS 9 also featured integrated support for Apple’s
suite of Internet services known as iTools (later re-
branded as
 .Mac, then MobileMe, which is now known as iCloud)
and included improved TCP/IP functionality
with Open Transport 2.5.

9. Other features new to Mac
OS 9 include:
 Integrated support for multiple user accounts without
using At Ease.
 Support for voice login through VoicePrint passwords.
 Keychain, a feature allowing users to save passwords
and textual data encrypted in protected keychains.
 A Software Update control panel for automatic
download and installation of Apple system software
updates.

10.  A redesigned Sound control panel and support
for USB audio.
 Speakable Items 2.0, also known as PlainTalk,
featuring improved speech synthesis and recognition
along with AppleScript integration.[5]
 Improved font management through FontSync.
 Remote Access Personal Server 3.5, including support
for TCP/IP clients over Point-to-Point Protocol (PPP).

12. What is MAC OS X?
 is a series of Unix-based operating
systems and graphical user interfaces developed,
marketed, and sold by Apple Inc.
 X is the Roman numeral for 10 and is a prominent part
of its brand identity, is a Unix-based graphical
operating system.
 the tenth major version of Apple's operating system
for Macintosh computers.

13. Advantages and Disadvantages
of MAC OS X
 Advantages  Disadvantages:
 Easy to use  Small software base compared
to Windows(with out useing
 Virus free bootcamp/parallels)
 With boot camp you can  Not nearly as customizable
run XP or Vista on your  Missing some features that
machine, are pretty basic with
Windows(no page up/down
 with Parallels you can key, no real backspace key,
run windows programs and you have to use the
in OS X control key to right click)

14.  Mac OS X Version InformationVersionCodenameDate
AnnouncedRelease DateMost Recent
Version
Rhapsody Developer
ReleaseGrail1Z4 / Titan1
UAugust 31, 1997May 14, 1998Mac OS X Server 1.0HeraMarch 16, 19991.2v3
(October 27, 2000)Public BetaKodiakSeptember 13, 200010.0
CheetahMarch 24, 200110.0.4 (June 22, 2001)10.1PumaJuly 18,
2001[69]September 25, 200110.1.5 (June 6, 2002)10.2JaguarMay 6,
2002[70]August 24, 200210.2.8 (October 3, 2003)10.3PantherJune 23,
2003[71]October 24, 200310.3.9 (April 15, 2005)10.4TigerMay 4,
2004[72]April 29, 200510.4.11 (November 14, 2007)10.5LeopardJune 26,
2006[73]October 26, 200710.5.8 (August 5, 2009)10.6Snow LeopardJune
9, 2008[74]August 28, 200910.6.8 (June 23, 2011)