I've been searching for ways to get Mail to do this for months..
Well, I decided to Entourage this morning, from within my employer's firewall, and set up my personal email account outside the firewall and it just worked. I may have specified "tunnel" or something like that.
Why did...
"Never mind!"
At some point it became clear that more was broken than just Mac OS X/DAVFS, so I contacted my ISP and they found a permissions problem on the server.
I had a sweet setup with a LAMP hosting provider. I could Connect to Server, post calendars from iCal, and everything.
I upgraded to Tiger and it's completely busted. Can't do anything.
I might be able to get my hosting provider to upgrade my Apache and/or mod_dav version. What would...