Microsoft's fastest-growing operating system is..

[kai_uk]

Windows XP!! 1 Month before the deadline and in terms of market share Microsoft's fastest-growing operating system is the never-say-die operating system Windows XP. It is still used on just under one third of all desktops, second only to windows 7.

 

[Victor Leigh]

Which goes to prove that old software do not die. They just become more and more popular as they age. Now after Microsoft stops supporting Windows XP, I can expect to see all kinds of services popping up offering third part support for Windows XP.