We're using MU with the domain mapper extension.
What I'm trying to accomplish is that I would like to have a subdomain on one of my mobile domains pointing to the same site. (dual-primary MU install) eg: http://www.xyz.com and m.xyz.com both loading the same site.
We have a plugin installed which deals with serving different content based on user-agent, but we'd like to have the mobile version live at the m.xyz.com subdomain.
I'm not having any luck with the mobile domain plugin, it seems to have not have MU support.