imapsync permission denied, shared folder

[brian]

I'm moving some accounts to a new server using imapsync and have just 
encountered an error with one account. The script attempted to create a 
sub-folder and failed:

-- snip --
 From Folder [Shared Folders.membership]
To   Folder [Shared Folders.membership]
To   Folder Shared Folders.membership does not exist
Creating folder [Shared Folders.membership]
Couldn't create [Shared Folders.membership]580 NO Permission denied
-- snip --

Now, the thing is, there is no directory with that name in this user's 
spool directory on the source server. Given the name, I'm guessing it 
resides elsewhere. Where/how is imapsync finding this "Shared Folders" 
directory? Can anyone think of a reason i'm seeing this?

Obviously, I'm not a mail professional.

imapsync \
--buffersize 8192000 --subscribe --syncinternaldates \
--ssl1 --ssl2 --noauthmd5 \
--authmech1 PLAIN --authmech2 CRAM-MD5 \
--host1 mail.SOURCE.org --port1 993 \
--user1 USER at DOMAIN.org --password1 xxxxxx \
--host2 mail.TARGET.org --port2 993 \
--user2 USER at DOMAIN.org --password2 xxxxxx --delete2

b