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Microsoft Windows Operating System: A graphical user interface (GUI) environment that consumers utiltize to run applications, such as Adobe Photoshop.

There are many different types of operating systems, such as Apple OS X and Linux-based systems such as Ubuntu.

The current version of Apple's operating system is OS X 10.5, aka "Leopard". It's based on OpenBSD, which has similarities with Linux.

Linux is an open-source operating system, meaning all the program code is available to anyone for free.

The first operating system many remember is MS-DOS, which stands for Microsoft Disk Operating System.

Versions of Microsoft Windows to date:
(1) Windows 1.0.
(2) Windows 2.0.
(3) Windows 3.0.
(4) Windows 95.
(5) Windows 98.
(6) Windows ME.
(7) Windows 2000.
(8) Windows XP
(9) Windows Vista
(10) Windows 7 (upcoming)

For information on getting and installing the Windows 7 beta, check out our Breaking news tutorial: Windows 7

For more information on Windows 7 visit Paul Thurrott's WinSuperSite at www.winsupersite.com/Default.asp.

MS-DOS debuted in 1982. The Apple I launched in 1976 and DIY kits like the Altair even earlier.

Mr. Mobile with Jay Goldman: Jay looks at the sleek and stylishJawbone Bluetooth headset from Aliph
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