I have found a very large file in ../offiles/ and it turned out to be a
personal note item of my own mailbox (at least gwcheck is only reporting
this item on mailbox statistics). I have deleted it in my mailbox, but
gwcheck does not remove the offile (ran structure and content checks as
instructed according to TIDs). Mailbox statistics does not report this
item anymore, so it seems that the attachment file is considered unused
or orphaned now.

But how can I get rid of it? It has been a personal note, this means
there can not be any pointer to this item for an other mailbox.

BTW: there seem to be plenty of unused offiles in the system, because a
full dbcopy does copy only approx. 70% of the space to the backup

Thanks in advance,