There have been 6 major versions. As of the time of this writing, the current stable release is Windows 7 (however, note that the internal version number is actually NT 6.1). Windows 8 (version NT 6.2) is currently in development.
For most major versions, there have been a few "minor" versions. This was evident in the name up to Windows 3.x. However, commercial branding has made the less evident since the introduction of Windows 95, which shared the same major version number (which was 4.x) with Windows 98 and Windows Me, for example. Windows 2000, Windows XP, and Windows Server 2003 all were version NT 5.x. And finally, Windows Vista, Windows 7, Windows 8, and Windows Server 2008 are all version NT 6.x.
To complicate things a little further, Microsoft started developing Windows NT, geared more toward business users, alongside the main line of Windows versions. This began with the initial release of Windows NT 3.1 in 1993. The Windows NT line was merged into (or, perhaps more properly, transformed into) the main line of Windows releases beginning with NT 5.1, also known as Windows XP. This was the first version of Windows NT to feature both Home and Professional editions, making it successor to both Windows 2000 (business oriented) and Windows Me (consumer oriented).
Drivers are written for many operating systems.
Virtual operating system
Many operating systems are "old", and many are new. Without specific systems to compare, your question is unanswerable and meaningless.
Windows, Linux, Mac OSX are currently the three most popular computer operating systems. Other operating systems are Solaris, BeOS, Google Chromium os, and many more.
There's no hard limit on the number of operating systems you can install. The limit will be dictated by the number of operating systems that support your hardware and the amount of space on your hard drive(s).
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When you network operating systems you will have the benefit of both operating systems. You have to ensure both systems are compatible before networking them.
An embedded operating system is an operating system for embedded computer systems. These operating systems are designed to be compact, efficient, and reliable, forsaking many functions that non-embedded computer operating systems provide, and which may not be used by the specialized applications they run.
Microsoft sells many operating systems most have Windowsin their name somewhere.
Operating systems are not in applications. Applications are installed on Operating Systems.
Unix and any Unix based operating systems can be downloaded for free. There are also many operating systems that can run on top of Windows or side by side. Many of these types of operating systems are Lynix based. All of these operating systems are "open source" which means that any one that knows how to, they can modify, rewrite, or add new features to the programs. Being open source software is that makes it free to download.
what are the disadvantages of operating systems effects of information technology