Originally Posted by tstfortruth
Are there any conversion tools or scripts that are well-tested for taking IMAP4 mailboxes from OSX 10.6.x server's mailbox format to a format suitable for migration to a CentOS linux mail server?
you seem to mix up things a little. The storage format of mailboxes isn't a matter of the operating system, it's a matter of the mail server software. So it depends on which mail server you are using under OS X, and which one under CentOS. Maybe they even use the same layout. After all, there are only two different mailbox types that have a notable prevalence.
One is the mbox format, where every mail folder is represented by a single file that holds all messages; the other is the maildir format, where each mail folder is a directory in the file system, and each message is a single file in RFC 2822 format.
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