There is a firewall that blocks be from connecting to my IMAPs server on the standard 993 port, so I have to run on a non-standard port.
It has been a while since I used Evolution on Linux, but I thought that it was done by specifying the IMAP server as host:port.
When I try and do that on the win32 client, it errors out because a subdirectory cannot contain a : in the name on Window's NTFS. Is there another solution to this, or am I gonna continue using thunderbird on Linux and Windows for a while longer?
you're doing it right. it *should* work. don't use the SourceForge bug tracking system to report problems with Evolution on Windows. use the GNOME bug tracker and be sure to indicate clearly that you are on Windows.