Subject line says it all. Ubuntu's release cycle is 6 months.
The previous and latest Windows releases will be more than 5 years
apart. The new version will introduce very little.
(ms.com, October 25th, 2001 -- yesterday!)
This proves that Open Source strides more quickly owing to modularity,
genuine motivation, etc. Here is a screenshot of KDE back in 2001 (XP
Admire the fast progress towards Compix/XGL, among other things.