We all know that the operating system is nothing but the collection of the software which manages the functioning of the computer. Microsoft Windows operating system is the most famous till now Windows 3.x to Windows 7 and the upcoming Windows 8. We all are familiar with the interface and functioning of these operating system but there are very few people who knows that what is the history of the Windows Operating system. So I am starting this thread over here and want to request you all to post some information about the history of this. I hope that this thread will be very helpful after replies.