Gartner believes it’s time for businesses with Web applications to start investigating less vulnerable Web server products [than Microsoft IIS].
Gartner, quoted in News.Com: “With the emergence of the Nimda worm — the latest in a long series to attack Microsoft’s Internet Information Server (IIS) and other software — Gartner believes it’s time for businesses with Web applications to start investigating less vulnerable Web server products.” 
[Scripting News]
