After being moved, messages remain in both folders on the server

[Mikhail T.]

I just noticed, that, when I move a message from INBOX to a folder in 
Thunderbird (via IMAP), the file on the server sometimes remains in both 
directories:

    /var/spool/imap/user/mi//message/.

and

    /var/spool/imap/user/mi//folder///message/.

The copies are a hardlink, so little space is wasted, but I'm concerned about 
the toplevel (INBOX) directory having too many entries... I thought, this is 
related to the folder (not) being immediately "compacted", but even when I 
explicitly request a compacting (in Thunderbird), the strangeness remains. Right 
now out of the 35170 messages in my INBOX, 1219 are hardlinked to other folders...

Is this normal? I'm using Cyrus imapd 2.4.11 on FreeBSD. Please, advise. Thanks!

    -mi

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