MMS:// Server software for Linux?
 

I have Debian linux for my server, and I don't want to change to a Windows server because it is more prone to security attacks.

What I am looking for is a (relatively cheap or FREE) software that allows me to use Microsoft Expression Encoder to stream to my Linux server (MMS://) format, then use Silverlight to read the MMS:// stream and display it to users, any help would be appreciated. thanks.