Operating Systems:
     An operating system is a special piece of software that controls the basic functions of a computer. OS acceptable after first reference.
     Always capitalize the names of operating systems. Preceding the name of an operating system with the company that makes it is optional.
     When referring to computer games, identify what operating system they are developed for. EA is releasing Madden NFL 08 for Windows PCs. NOT: EA is releasing Madden NFL 08 for the computer. Specify individual versions of the operating system only if context requires (i.e. discussions of system requirements).

     Use the following examples when referencing operating systems:

Microsoft DOS – DOS acceptable on all references.

DOS 6.0

Microsoft Windows – Windows accept- able on all references. Windows comput- ers can be referred to as PCs on all references.

Windows 3.1
Windows 95
Windows 98
Windows 2000
Windows ME
Windows XP
Windows Vista

Apple Macintosh – Macintosh or Mac OS acceptable on all references.
Mac OS 9.1
Mac OS X
macOS

Linux – Do not refer to specific distributions of Linux. When discussing Android cellphone or Android tablet operating system, it is standard to notate the version number and name of the operating system.