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...nally hangs while building the index and/or uidlist. It leaves a lock file "dovecot-uidlist.lock" around and the IMAP process reading that folder never completes successfully. To fix it, I have have to rename the message files to remove the keyword. For example: $ mv 1146246349.P365Q2.mail1b.r1.iad.emailsrvr.com:2,Sa 1146246349.P365Q2.mail1b.r1.iad.emailsrvr.com:2,S I reverted back to the copy of src/lib-index/mail-index-transaction.c from the 4/14/2006 CVS snapshot, and this problem completely went away. And mailboxes that were encountering the .lock problem suddenly worked again....