Unfortunately I do not believe that it is possible. Also, be aware that if you are using the Community Edition version you will need to ensure any changes you do make are in line with Zimbra Licensing.
It is possible but i don't know if it in line with zimbra's license so i won't post without permission to do so
I think you could use another installation of apache to use it as a proxy. That would require a bit of setup up but it could be done, I use a similar method to host zimbra on mail.mydomain.com and apache mydomain.com on the same server.
Last edited by Mccreations; 01-26-2009 at 06:11 PM.