Well, my first Linux installation was between Redhat 5.1 and 6.0 beta, so its was about 1998-1999.
It was first in 2003/2004 I fully immigrated to Linux as the default desktop OS at my work(servers had be running Linux since 2000).
At the time I was using Fedora core 1 and core 2.
The first time I saw the Ubuntu 4.10 for the first time, I was hooked..
The rest is just history...