Netscape's premium
web server product. This was the centerpiece of Netscape's
SuiteSpot server bundle.
FastTrack Server was the low end server. Enterprise has since evolved into
iPlanet Web Server, Enterprise Editition.
Enterprise Server was the first web server to offer SSL, and was initially very popular for serving high volume websites. It has since been surpassed by Apache and Microsoft IIS in popularity, but still controls (along with FastTrack) about 2% of the general web server market.