Microsoft Windows also referred to as Windows, Windows OS or Win is a graphic operating system that is developed by Microsoft Corporations to run personal computers. Windows now is a group of several Graphical User Interface operating system, all of which are developed by Microsoft Corporations. Microsoft Windows includes various groups which further are divided into several other sub-groups. For instance, Windows NT, Defunct Microsoft Windows and Windows IoT are groups belonging to the Microsoft Windows family whereas they do include sub-groups like Windows Server, Windows Mobile, Windows Companion, Windows Phone, etc.Microsoft Windows Versions
Microsoft made an initial release of an operating system named Windows on November 20, 1985 in the form of a graphical operating system shell for MS-DOS. It was introduced in response to the growing market interests of the Graphical User Interface (GUIs). At that time Mac OS was the only operating system that was there in the market. It being released a year earlier, was the only operating system at that time. With the arrival of the Microsoft Windows around 90% shares were backed by the Windows thus ruling the personal computer market around the world. The Windows 1.0 was not actually a complete operating system but rather it extended the MS DOS. The components that were included in the Windows 1.0 were Calculator, Calendar, Cardfile, Clock, Clipboard viewer, Paint, Reversi, Notepad, Terminal and Write. In Windows 1.0 version, all the windows were tiled and not were of the overlapping version. There were many components that Windows 1.0 lacked but due to limited operating systems available at that time, it was considered to be good.
Later in the December of 1987, Windows 2.0 version was released. As compared to Windows 1.0 it had most of the components and that was the reason for it gaining more fame than its predecessor. It included several improvements to the user interface and also to the memory management. It did involve introduction of more sophisticated keyboard shortcuts and also usage of more expanded memory. It was in Windows 2.03 version that the overlapping windows replaced the tiled windows screen. Then came Windows 2.1 which made use of the Intel processors for its functioning. The Intel processors were made use of to multitask the various DOS programs and also the paged memory model that was emulated using the extended memory. All these earlier versions were actually thought of as the graphical shells of the MS-DOS and were used for the file system services.
Then came Windows 3.0 version which was released in the year 1990. It had improved design which was mostly because of the loadable virtual device drivers and because of virtual memory. The Windows 3.0 applications were capable of running in various protected modes. Windows 3.1 and Windows 3.2 both release in the year 1992 and 1994 respectively brought significant changes to the Windows framework.
On August 1995, Windows 9x released its first version, namely the Windows 95 which was still MS-DOS based but did introduce 32-bit applications, pre-emptive multitasking, plug and play hardware, increased stability and much more to its previous versions. In this version the object-oriented user interface did replace the previous Program Manager that lacked the Start menu, taskbar and the Windows Explorer shell. It also was the first version to be introduced with the first version of the Microsoft web browser, the Internet Explorer. The Windows 9x version also had the release of Windows 98 that did introduce the Windows Driver Model, support for USB composite devices, ACPI, hibernation and for the multi-monitor configuration.
