AmigaOS
MS-DOS (and compatibles like FreeDOS, DR-DOS, ROM-DOS)
Windows 1.0
Windows 2.x
Windows 3.x
Windows 95
Windows 98
Windows ME
Windows CE
Mac OS / System Software 1 - 9
AtariDOS
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WindowsMac OS XLinuxFreeBSDNetBSDOpenBSDMS-DOSFreeDOSAmigaOSBeOSMorphOSQNXOS4000VxWorksReactOSDR-DOSSolarisTOSGEMNetWareOpenVMSSyllableHaikuAROSMenuetOSKolibriOSLynuxWorksMulticsSystem/360Unixall of them
4 generation operating system
Some operating systems that are available with new laptop computers are some more common systems like the following: Windows Vista, and the Vista Ultimate.
Most operating systems have an on off function, and allow different users to use the computer. Some have hibernation and lock functions.
No, there are no operating systems that come included with instant messenger. This is something that can be obtained through programs like Yahoo, Hotmail, and AOL.