Mailflow between Exchange 365 and on premise Exchange 2007 after Staged Migration
Posted on 2016-11-25
I just started with Office 365 and would like to migrate 40 users from Exchange 2007 using Staged Migration. I’ve done the research and feel that understand the process reasonably well. I understand that during the migration the mail flow between on premise exchange and Exchange Online is done using TargetAddress attributes and once all users are migrated I need to convert on premises mailboxes to Mailbox Enabled Users and point MX record to Exchange Online.
However, when the migration is done, I don’t want to decommission Exchange 2007 as need to keep some service mailboxes on Exchange 2007 and ensure there is a mailflow between Exchange Online and on premise one. I other words I want to achieve that if an email is sent to on premise mailbox, Exchange online would redirected to Exchange 2007. Emails sent from Exchange 2007 should go out straight to internet. Also I need successful mailflow between mailboxes on Exchange Online and Exchange 2007.
So my question is whether I can set up connectors (or something else) between on premise Exchange 2007 and Exchange online so mail flow is achieve between all mailboxes on both Exchanges.
I understand that using Hybrid migration would do the job but it involves installing Exchange 2013 and set up is more complex. Also, we don’t need rich co-existence so Hybrid is just an overkill for us.
Any help would be much appreciated.