did more googling, and tried this, and for the most part worked, except it missed subfolders from old server:
** another look, it does get the sub folders, they just aren't nested like a subfolder. **
imapsync --host1 192.168.55.1 --user1 dan --password1 password --host2 192.168.55.101 --user2 dan --password2 password --authmech1 LOGIN --authmech2 LOGIN --sep1 / --prefix1 / --sep2 / --prefix2 ""
not sure what to try to get the subfolders (basically I need "all" mail folders)
thanks in advance