This procedure can be used to move a imap folder between users on a server (or between servers).

• copy imap folder over.
• chown all to cyrus:mail
• make sure there's a cyrus.header file in there, (touch and chown it if not)
• stop cyrus
• /usr/lib/cyrus/reconstruct -rf user.newuser
• start cyrus

• fix ACL on new directories:
• grab a directory listing one per line (find -type d), create a vim script to change each line to 2 lines, and do the following: for eg:
  • dam user.newuser.copied-directory.“subdirectory with spaces” olduser
  • sam user.newuser.copied-directory.“subdirectory with spaces” newuser lrswipkxtecda

• replace slashes with dots in sub/subdirectories
• escape quote marks ' → \'

• paste the script into cryadm

dam = delete acl on mailbox, sam = set acl on mailbox