I saw that before but there is only maildir -> mdbox but not mdbox -> maildir

Did I have missed anything there?

From: dovecot <dovecot-bounces@dovecot.org> on behalf of Sami Ketola via dovecot <dovecot@dovecot.org>
Reply-To: Sami Ketola <sami.ketola@dovecot.fi>
Date: Tuesday, June 18, 2019 at 9:58 PM
To: Dovecot Mailing List <dovecot@dovecot.org>
Cc: Ralph Seichter <abbot@monksofcool.net>, Odhiambo Washington <odhiambo@gmail.com>
Subject: Re: mdbox to Maildir

On 18 Jun 2019, at 16.59, Odhiambo Washington via dovecot <dovecot@dovecot.org> wrote:

On Tue, 18 Jun 2019 at 01:35, Ralph Seichter via dovecot <dovecot@dovecot.org> wrote:

* Odhiambo Washington via dovecot:

> Is it possible? How do I do it for ALL mailboxes?

This has been asked (and answered) recently; see the Dovecot Wiki.

-Ralph

Could you kindly point me to the exact article in the wiki, please?

https://wiki.dovecot.org/Migration/MailFormat

Sami