[Dovecot] The perfect Courier -> Dovecot conversion tool

[Timo Sirainen]

I've tested this only with a test user.

http://dovecot.org/tools/courier-dovecot-migrate.pl

http://wiki.dovecot.org/Migration/Courier

# Migrate Courier IMAP (any version) and Courier POP3 (v0.43+) to
Dovecot v1.0
# by Timo Sirainen. This is public domain.

# Usage: [--quiet] [--convert] [--overwrite] [--recursive] [<conversion
path>]
#   --quiet: Print only errors
#   --convert: Do the actual conversion. Without this it only shows if
it works.
#   --overwrite: Ovewrite dovecot-uidlist file even if it exists
already.
#   --recursive: Recursively find maildirs to convert
#   <conversion path>: Maildir directory, or with --recursive its parent
#                      directory or its parent's parent

#  - If courierpop3dsizelist is found, it makes its best effort to keep
the
#    POP3 UIDLs, unless the file is more than 30 days older than
#    courierimapuiddb (user probably stopped using POP3).
#  - If courierpop3dsizelist isn't found (or it's old), the
dovecot-uidlist
#    is directly converted keeping all the UIDs.
#  - Keywords are converted from courierimapkeywords/ to maildir
filename
#    flags and dovecot-keywords file
#  - Subscriptions from courierimapsubscribed are added to Dovecot's
#    subscriptions file

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