Fun with Windows Version Numbers

While Apple increases version numbers for each major release, it seems like Microsoft does things a little bit different. So they develop updates and depending on their Marketing they choose between making it a small update or a big update:

Version	Marketing Name
4.0	Windows 95
4.1	Windows 98
4.2	Windows ME
5.0	Windows 2000
5.1	Windows XP
5.2	Windows Server 2003
6.0	Windows Vista / Server 2008
6.1	Windows 7 / Server 2008 R2

So while Windows 7 for most people is a paid upgrade to a new version, internally it is just a 0.1 bug fix release and for the server they do label it as R2. So do not wonder why the system version functions return 6.1 for Windows 7. On Mac OS X Snow Leopard, you do get a 10.6 and not a 10.5.9 :-)