Hello, I understand the cyrus.header file is the only irreplacable one, i.e. cyrus.index and cyrus.cache can be regenerated using 'reconstruct' while cyrus.header, a very small (150 bytes or thereabout) and stable file, contains some vital mailbox identification data. I observe a cyrus.header file only gets modified when the mailbox ACL is changed or when annotations are added. Am I correct in assuming this ? So most accesses to cyrus.header files are read operations. Does it therefore make (some) sense to leave the cyrus.header files with the message files and not with the other metadata ? I am not considering cyrus.expunge and cyrus.squat here for the sake of simplicity. Thank you for your comments, Eric Luyten, Computing Centre VUB/ULB, Belgium. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html