[Dovecot] integration of old mails into new dovecot Maildir

[Steffen Kaiser]

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On Mon, 14 Apr 2014, K. C. Mohan - Personal wrote:

> 1)      how are the messages storred on the old server, which storage
> backend do you use, maybe Maildir?
>
> Yes, Maildir. Dovecot  version is 2.1.7.
>
> 2) the storage backend on the new server?
>
>                     Maildir. Dovecot Version 2.2.9.  Mysql virtual users
> authentication. Plain login

As both are Maildir from Dovecot, you can copy all the Maildir hierarchie 
1:1 to the new server. Dovecot upgrades them automatically most of the 
time. I did so from Dovecot v1.x to v2.2 with almost no problem.

To keep the UIDs for POP3, ensure the same:

pop3_uidl_format = %08Xu%08Xv

is used on the new server.


If you already got new messages on the new server, you can think about:

a) migration, e.g. as Jiri pointed out

b) merge both Maildirs, but remove all "new" control files dovecot*, keep 
only the old ones. That way the new messages will be added to the old 
store by getting new UIDs.

- -- 
Steffen Kaiser
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