eWeek Says "Apache 2.0 Beats IIS at its Own Game"
Jim Raposa of eWeek compared Apache 2.0 for Windows to Microsoft Internet Information Server 5.0 and found IIS wanting. The review says, in part:
eWEEK Labs compared the performance of Apache 2.0 and Microsoft Corp.'s Internet Information Services 5.0, both running on Windows 2000 Advanced Server. Apache kept pace with IIS during the entire test, which means that sites that move from IIS to Apache 2.0 on Windows won't have to worry about taking a performance hit.
When it comes to security, IIS doesn't come close to Apache. Apache's security track record is excellent, while IIS has taken hit after security hit. Just last week, Microsoft announced that 10 new security holes (several of which were serious buffer overruns) had been discovered in IIS.