It's also the 20th anniversary of the introduction of Windows 95. Truly a dark day. 
Windows 95 was the first version that was worth running all the time. Up until then I just ran DOS and occasionally loaded up Windows 3.11 (I think I spent more time tweaking device drivers to make it faster than running applications). I briefly tried OS/2 Warp and again just tweaked it for a few weeks, but as soon as Windows 95 showed up it didn't stand a chance.
