Any success using Elgg on a Zeus server?

Hey there... I am wondering if anyone has had any success running Elgg on a Zeus server. I discovered that my ISP was not running Apache as I thought (and wants me to pay to migrate servers!). I was told by my ISP that I need a mod rewrite converted from Apache for Zeus in order to run Elgg...

Has anyone else run into this problem? Can Elgg be run on Zeus or an I out of luck?

Thanks for any experienced advice you can give...

wayne