History of OS

Windows 2000 Professional

Feb 17, 2000

Brand Microsoft
Programmers Microfot Team
Price $126.99

Windows XP Professional

Oct 25, 2001

Brand Microsoft
Programmers Microsoft Team
Price $69.95

Mac OS X v10.2 "Jaguar"

Aug 24, 2002

Brand Apple Inc
Programmers Apple Inc Teamwork
Price $44.99

Mac OS X v10.4 "Tiger"

Apr 29, 2005

Brand Apple
Programmer Apple Inc Teamwork
Price $49.99

Windows vista Home Premium

Nov 30, 2006

Brand Microsoft
Programmers Microsoft teamwork
Price when release $239

Mac OS X v10.5 "Leopard"

Oct 26, 2007

Brand Apple
Programmer Apple Inc Team
Price 251.48

Windows 7 Home Premium

Jul 22, 2009

Brand Microsoft
Programmer Microsoft Team
Price $259

Mac OS X v10.6 "Snow Leopard"

Aug 28, 2009

Brand Apple Inc
Programmers Apple Inc Teamwork
Price $59.99

OS X v10.7 "Lion"

Jul 20, 2011

Brand Apple Inc
Programmer Apple Inc Teamwork
Price $29.99

OS X v10.8 "Mountain Lion"

Jul 25, 2012

Brand Apple Inc
Programmers Apple Inc Team
Price $19.99