Windows XP and Windows 7
Windows is the most widely-used desktop operating system made by Microsoft.
windows
One of the most popular and widely used operating system is Microsoft Windows. It is compatible with most devices and has proved to be user-friendly.
MS-DOS was the first widely used operating system
There are several possibilities, but Windows CE is fairly widely used.
disk operating system
Windows is typically the best system for server hosting. The reason for this is compatibility and better "bang for your buck." Frankly in the corporate world there are cheaper Windows PCs and for that reason it is the widely used operating system which makes sense for the use of a compatible system to host a server.
I would say Windows, Mac, and Linix. But, this source says that its ITRON a Japanese operating system. Go to this link for more. http://www.linuxinsider.com/story/31855.html
There are no widely used versions of DOS. It hasn't been used as an operating system since Windows 95 came out. If I recall correctly, the last version of DOS was 7.5 back in the early 1990s.
An operating system is the system working on the computer. Linux and Windows are both operating systems used in businesses.
Windows is an operating system that is used for operating a computer, actions like going online, playing games and using media.
Computers need some kind of operating system; the most widely used is windows (from Microsoft). Other systems exist as well, such as Linux.