Howdy,

I've just migrated a couple of servers to Dovecot, and am loving it so far. I thought I'd share the courier2dovecot shell script I whipped together (based on the instructions I found in the wiki.dovecot.org migration how-to), for converting Courier-IMAP maildirs to Dovecot format. It can be downloaded from my home page:

http://bendiken.net/scripts/

While the script is rather simple, it can save a fair bit of typing when migrating some hundreds of mail accounts... especially since Courier stores some of its own state files recursively in each folder of the maildir hierarchy, making it a real pain to otherwise manually rename or remove all of them.

Here's a plain-English summary of what the script currently does, when given a Courier maildir path as an argument:

• check that the given path is indeed a valid Courier maildir, and exit if not
• rename the file 'courierimapsubscribed' to 'subscriptions', and strip the 'INBOX.' prefix from its contents
• recursively rename all of files of the name 'courierimapuiddb' to 'dovecot-uidlist'
• recursively delete all of files of the name 'courierimaphieracl', 'courierimapacl' and 'courierimapkeywords'

The script will also verbosely print out each action it does, handy for redirecting the output to a log file for a large migration.

I hope people about to jump ship from Courier to Dovecot find this useful. If anyone comes up with improvements to the script, please send them my way :-)

Arto