How does one transfer a user's inbox (and subfolders) to another user?

[Joseph Silverman]

I tried 'mv /var/spool/imap/r/user/ruser /var/spool/imap/s/user/suser/ 
ruser-copy' and then 'reconstruct -f -r user/suser' - this simply  
didn't do the job, though all indications from the man page are that  
it should.  Is this even possible in cyrus?  I tried all sorts of  
combinations of command and nothing seems to do it!

- Yossie