I use:
- Windows for daily activities, and to earn my daily bread—for example, this site is prepared on a Windows box;
- Open BSD, an open source operating system which offers security, for my servers, including my internet connections;
- SuSE Linux and Free BSD for occasional extra income;
- Bell Labs’ Plan 9 for interest.
There are some interesting things going on in the OS world. Visit OS News to find out more.