Top 6 domains in terms of page-views in February 2006 according to Media Metrix were: 1) Yahoo, 2) MySpace, 3) MSN, 4) Ebay, 5) Google, and 6) Hotmail.

4 of the top 6 sites (MySpace, MSN, Ebay and Hotmail) run on IIS and Windows.

Linux and Apache may have market share, but enterprise, mission-critical sites rely on Microsoft

Source: Scott Guthrie