I want to do a staged migration on my office 365 setup. What i'm trying to do is add a group of users cloud while keeping other users on Lotus Domino. If an email comes and they're not in the initial group it will send it on to the Lotus Group where other users have yet to be migrated.
Whenever we change our MX record all email will be flowing to office 365, and not Lotus so we want to do it in stages (groups). I know it can be done with exchange because it has send connectors. We aren't sure if you can do this in office 365.
1) You set your email server to accept email from Exchange Online.
2) You set up Exchange Online with your email server details.
3) You change your MX record to Exchange Online.
At this stage you have ALL email flowing to Exchange Online first and then being relayed to your normal email server. You can now set up individuals to communicate via IMAP to either your local email server OR Exchange Online.
The purpose of this is to keep your local email server in-sync with Exchange Online should you choose to back out for any reason.
It sounds like all you need to do is set up a group of user's email clients to talk to Exchange Online rather than your local email server.
I hope this helps!