Re: POP3 UIDLs with virtual INBOX and migration from maildir->mdbox

On Thu, 2012-02-09 at 15:35 +0100, Peter Mogensen wrote:
> Hi,
> 
> Considering the scenario, where you have some old account with a 
> different POP3 UIDL format and you migrate them to dovecot.
> 
> So these old UIDLs would be saved to dovecot-uidlist.
> 
> At some later time you want to introduce a virtual POP3 INBOX like 
> described on:
> http://wiki.dovecot.org/Plugins/Virtual
> 
> So you decide to make the new UIDL format "%f" - to make them unique 
> across folders.
> 
> So far so good.

Assuming the messages are in the same order, so far so good.

> But then you decide to migrate to mdbox with all your old UIDLs.
> The docs says that saving old UIDLs is only supported in Maildir and 
> that %f is only supported in Maildir.
> 
> So is this at all possible?
> 
> Would pop3_uidl_format = %g solve this (except for the old legacy UIDL's) ?

%g and %f are equal with Maildir. And if you migrated with dsync from
maildir to mdbox, then all GUIDs and POP3 UIDLs are preserved. But test
it first!