Adora will configure itself for single-platform use automatically, so if cross-platform capability is not important to you than you can skip this section.
The most important thing for acheiving cross-platform (or trans-platform) email is a common place to store the messages. The MH program for UNIX/Linux uses the "Mail" directory for this purpose. Since it seems easier for Linux to use Windows partitions than vice-versa, it makes sense to keep the common directory on the Windows partition(s). The only trick is that the windows partition must be mounted by the user who is using Adora under Linux, in order for the permissions to be set right on the Mail directory.
The easiest way to do this is set up Adora on windows first, and then run it. This will set up the Mail directory in the directory where Adora is installed. Then under linux mount the windows partition and create a link in you home directory like this:
ln -s /dos/Program Files/Adora/Mail /home/myhome/Mail
where /dos is the mount point of your windows partition, and obviously interchange the correct locations on your system for Adora's windows installation directory and your linux home directory.
Now when you run Adora under linux you must have the windows partition mounted by the user who is using Adora.