"Indeed, Apache had been the leading Web server for so
long that people tended to take it for granted - to the point where
they forgot that here was a clear case of open source trouncing
Microsoft, whose Internet Information Services (IIS) offering had
only a piffling share.
"Microsoft, of course, was well aware of this inconvenient
high-profile advertisement for the power of open source, and around
about three years ago made a very serious effort to unseat Apache,
using every means at its disposal. As the share of IIS steadily
rose, and that of Apache steadily fell, it seemed that Microsoft
might even manage the trick."