Apache lost a little this month, with only 60.44% market share at 9,095,140 servers. This is still almost 3 times Microsoft's market share, which is 21.07% at 3,171,467 servers.

From the Netcraft web site:

"The Netcraft Web Server Survey is a survey of Web Server software usage on Internet connected computers. We collect and collate as many hostnames providing an http service as we can find, and systematically poll each one with an HTTP request for the server name. In the May 2000 survey we received responses from 15,049,382 sites."