Server migration

[Sami Ketola]

> On 1 Nov 2016, at 14.10, Tanstaafl <tanstaafl at libertytrek.org> wrote:
> 
> 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?


If you fetch emails over imapc and store to dovecot dsync will preserve IMAP UIDs.

Sami