cyrreconstruct loosing emails

[Markus Heller]

Dear list(s)

excuses for cross-posting, but what I have experienced today is really 
alarming.

I have a kolab-based cyrus installation and I wanted to make the contents of a 
direcory accessible to a the according user.

In order to archieve this I followed the instructions as given here:
http://wiki.kolab.org/index.php/Backups_for_kolab2

The problem here was that the mailbox (directory) came from another imap 
server. Acordingly I deleted the cyrus* files, dumped the mailbox list, added 
the entry, read it back in.

After that, I did a cyrreconstruct -rfx. 

And I had to notice that a number of emails were completely lost. How can this 
happen? Obviously, cyrreconstruct really deleted emails!!

Has anyone of you seen this before? Does anybody have an explanation? 
Under which circumstances can emails be deleted by cyrus imapd? Could the 
imapd client (kmail) have played an evil role? 

Thanks in advance!

Markus