When I try to access any MSN domain, Hotmail, and Yahoo mail at my school, I get a message similar to the following:

Your request for the page [url]http://autos.msn.com[/url] has been denied due to access control.
Im pretty sure that the school district servers are running Apache 2.0.54. I haven't found any blocking software on the local workstations, so the blocks may be on the server. The PCs are running Windows XP pro with SP2 and are protected with McAfee Virusscan enterprise. They also have Deep Freeze.