I've got a back end exchange server that we have been running for a few weeks now with about 40 mailboxes on it and it works great. OWA worked right out of the box and everything is fine. i just recently brought up a new server that is also an exchange 2003 server (both are running SP1 now) and that one looked fine to though i couldn't test OWA because it had no mailboxes (trying to use OWA in it redirected to the other exchange server) but i didn't have any issues as far as i know.
I turned the box into a front end (by just checking that checkbox in ESM and rebooting) and when i try to use the OWA on the box now, it loads half of the graphics (some toolbars, some colors) and has a "Loading..." peice of text in the main section, and it just hangs there. i've looked at a few microsoft articles on this and i've blown away the virtual folders in IIS and rebuilt them, i've reinstalled exchange (uninstalled, reinstalled, said yes to overwriting half a dozen files, then service packed it up to SP1, then turned it to front end exchange) and i've tried a whole bunch of other things that didn't do anything.
I'd really like to get this up because its holding up setting up RPC/HTTP and a whole bunch of other things that i want to do on this front end. any ideas?