dovecot - Sep 2008 - cyrus2courrier mass migration

Hello,

So we've chosen to use dovecot as our imap mail server and replace our
old cyrus server ! BUT :

I would like to do a conversion of my imap accounts (and keep all theirs
characteristics) from cyrus-imapd-2.2.12 in cyrus format to dovecot
1.1.3 in courrier format.

I've tried those 3 tools :

cyrus2courrier.1.5.ts
cyrus2courier-1.3z4
imapsync (works well but very slow and should not be a true solution)

But nothing is working to keep the seen/unseen flag (expect imapsync) !
I know my cyrus version is too "recent" but do you have any idea how
could I do this migration ?

A second problem is that I have 600 Go of imap account to migrate, if
you've any clue on how to do a migration without loosing a lot of
availability, I would be happy to read you !

Tanks in advance.
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* Mathieu Kretchner <mathieu.kretchner at sophia.inria.fr> [2008-09-22
16:11]:
> I would like to do a conversion of my imap accounts (and keep all theirs
> characteristics) from cyrus-imapd-2.2.12 in cyrus format to dovecot
> 1.1.3 in courrier format.
> 
> I've tried those 3 tools :
> 
> cyrus2courrier.1.5.ts
> cyrus2courier-1.3z4
> imapsync (works well but very slow and should not be a true solution)
> 
> But nothing is working to keep the seen/unseen flag (expect imapsync) !
> I know my cyrus version is too "recent" but do you have any idea
how
> could I do this migration ?
cyrus2courier 1.5.ts should work with Cyrus 2.2.12 if the seen (and
subscription) states are available in flat text files; otherwise, they
must first be converted using cvt_cyrusdb(8).

However, for our conversion, we've written our own "cyrus2dovecot"
which
also supports skiplist databases (amongst another few features not
provided by the other tools):

	http://cyrus2dovecot.sw.fu-berlin.de/

Holger