Server migration

[Tanstaafl]

On 11/1/2016 3:58 AM, Sami Ketola <sami.ketola at dovecot.fi> wrote:
> On 31 Oct 2016, at 13.11, Tanstaafl <tanstaafl at libertytrek.org> wrote:
>> Ok, interesting. So... how does dsync do it? Or would it only work
>> between two dovecot servers?
>>
>> I'm interested in migrating from other servers (Office 365 in one case).

> Dsync does not use IMAP protocol to store the mails to storage but instead uses the 
> dovecot storage API to do that. Internally we can set what ever properties we want to
> including IMAP UIDs and POP3 UIDLs. 
> 
> Migrating from legacy system should then be done by pulling the mails from the
> legacy platform by using the imapc connector and storing them by using the internal apis.
> 
> We can also store mails to imapc: location but in that case there is many properties that
> will be lost due to limitations of the IMAP protocol.

Thanks Sami, but I don't see a definitive answer top my question in the
above...

So, when migrating from legacy system (legacy = non-dovecot) using
imapc, is dovecot able to preserver the UIDs?

Thanks, and my apologies for being a bit dense...