Have you had a look at mailsync?
I see nothing in the documentation to suggest that it can deal with one server that supports folders with messages and subfolders and a second server which does not. In fact, the WHATSNEW file notes that as of release 5.0.0
it should be possible to sync stores which contain folders with
messages _and_ submailfolders. However if two stores do not _both_
allow messages _and_ subfolders in folders at the same time,
submailboxes will be created first and messages in folders that
contain subfolders will no be synchronized!That reads as a pretty clear statement that mailsync cannot adapt my existing mail store to conform to the limited capabilities of the destination server.
If I find a different tool that can automatically "homogenize" my folders on the source server first, perhaps then I'll use mailsync for the bulk transfer. So thanks, Tomas, for bringing it to my attention. But my search continues....
