I recently tried to get this configured for my N900 with my company's setup (it seems to be a Lotus setup that supports ActiveSync), in the setup instructions provided by my company's IT infrastructure group, it states that the server should be configured as:
"$HOST.$MYCOMPANYSDOMAIN.com/servlet/traveler"
(portions redacted on-purpose)
however attempting to add the path aft-FQDN greys the "Next" button.

I remove the offending relative path info from the server field and choose "Next", I am then greeted by a "Configured Server is not an Exchange server" banner (probably correctly so; there's a pre-mail web interface at the root). Thoughts? Anyone else face this and conquer it?