in 1991 Linus
Torvalds (Finland) creates Linux,
a free port of Unix for x386
PCs
in '90 the OSs
market offers many choices (some 10 different OSs exist
just for Intel-based PC and there are many other hw
platforms too), but it becomes dominated by Microsoft
products
in late '90
there are few choices remaining for PCs, apart of Windows
9x and NT
nowadays Linux
is the most promising OS for the enterprise/servers
market (despite of Microsoft effort to impose NT), when
Windows is predominating in the SOHO and home market