No. Microsoft is a company (an organization). Mocrosoft MAKES an operating sysyem called "Microsoft Windows".
Windows is an operating system developed by Microsoft. Apple makes Macintosh computers that run Apple's own Mac OS X operating system but can also run the Windows operating system.
The Operating System (OS), for example Microsoft Windows.
Its an Operating system which makes the computer do the commands you need it to do.
What makes you think Windows 3.i is not an operating system? Actually Windows 3.1 came as two parts, Windows 3.1 and MS DOS. Windows still comes that way! MS DOS is the operating system that runs the computer. Windows 3.1 contains the programs that you used. The operating system and the programs in Windows 7 are made separately, you simply do not realize that when you use the program.
There is no Microsoft Apple. Microsoft is a company that produces software such as the operating system called Windows or the word processor Word. Apple is another company that makes the Macintosh range of computers which use Apple's own Mac OS X operating system. Both companies produce software that works on the other companies operating system. For example Microsoft produces a version of Word for the Macintosh and Apple has a version of iTunes that works on the Windows operating system.
It's source code is not publicly distributed or documented.
many companies ! Mint, ubuntu, Redhat ,....
Operating systems are developed by 3 major companies. Microsoft makes Windows, Macintosh makes macs, and Linux makes Linux operatin systems. There are a variety of versions of each OS.
Unix is no longer a single operating system, and as such no single company makes it. Historically, Unix was created by AT&T. Nowadays, operating system collectively referred to as "Unix" are created by companies such as Sun (Solaris), Hewlett-Packard (HP-UX), IBM (AIX), and Apple (Mac OS X).