Mail database error and unknown folders - what are they?

Hi - Forgive an elementary question: I administer a small office network, but am NOT an IT expert!
We've been running OS X 10.5. server for quite some time and are now on 10.5.8 with client workstations all running 10.6.1. We've had a problem with a corrupt cyrus database reporting (amongst other things):-
"DBERROR db4: Database environment corrupt; the wrong log files may have been removed or incompatible database files imported from another environment"
This is well covered elsewhere, but despite downloading and running mailbfr I have not been able to get rid of the problem. However, my question is this: whilst rooting around the mail database I have found the following folders:
var/spool/imap/^-^_-+^_-+^_-^-obscure
var/spool/imap/^_-bingey
var/spool/imap/^_-delegating
var/spool/imap/^_-moustache
var/spool/imap/^_-obscure
var/spool/imap/^_-plebes
var/spool/imap/^_-reinserting
Each of these folders has a cyrus.cache, cyrus.header and cyrus.index file inside. I can find no relevant search results when I check these folder names out with an internet search, so I'm wondering whether these folders should even be there? Have they been installed covertly, and if so can I remove them without further damaging our database?
Any help would be appreciated.
Thanks

http://discussions.apple.com/thread.jspa?messageID=4275025

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