Apache Web Server
The Apache web server has consistently been the most popular web server on the Internet since April of 1996. The April 2013 Netcraft Web Server Survey found that almost 60% of the web sites on the Internet are using Apache, thus making it more widely used than all other web servers combined. The combination of Apache's reliability and flexibility will no doubt ensure that it continues to keep it's place as the top web server.
We currently have Apache 2.2 and 1.3 on different servers, although all newly commissioned servers are being installed with Apache 2.2.