Kolab with database IMAP server

[Sebastian Schlatow]

Am 21.01.2014 18:21, schrieb Aleksander Machniak:
> On 01/21/2014 02:13 PM, Sebastian Schlatow wrote:
>> Hello, does Kolab support IMAP servers like DBMail
>> http://www.dbmail.org/ or Archiveopteryx http://www.archiveopteryx.org/
>> for storing mails in database?
> I'd be surprised if they supported ANNOTATEMORE or METADATA extensions.
> So, the answer is No. I think the only option for today is recent
> version of dovecot.
>
Dovecut is a filebased IMAP server as far as I know. How is the
performance of Dovecut compared to a database IMAP server like DBMail or
Archiveopteryx?