Here's a tip for those of you who want to share your playlists between MB and iTunes (in my case version 10.4.1).
To copy from Music Bee to iTunes:
Open both applications
Drag the playlist you want to copy from MB to iTunes, and drop it on the left of the window below your existing playlists. This will create a new playlist of the same name, but it will be empty.
Highlight all the songs in the playlist in MB (CRTL A) and drag them to the playlist in iTunes.
To copy from iTunes to Music Bee:
You can't copy the playlist name, so create a new playlist in MB with the same name as the playlist you want to copy.
Highlight all the songs in the playlist in iTunes and drag them to the new playlist in MB - it's that simple!
I spent ages trying to export playlists from Music Bee by right clicking the playlist and choosing List/Export as External Playlist. I tried every format for the playlist (you can change this in Edit/Preferences/Library) but iTunes refused to import any of them.
Enjoy - this is a very special application!
Jason