Office 365 migration from on-prem - is mailbox sync one way to office 365 or two way?
Doing a Office 365 migration from on-prem Exchange 2007 using a cutover migration.
Is the mailbox sync in the migration batch one way to office 365 or two way (mail received at Office 365 ends up on the Exchange server)?
Reason that I'm asking is that all the guides I found show switching the DNS to Office 365 before clients are switched. It seems to me that this is backwards and you'd want to switch the clients first, then the DNS MX record as the final step.
If the DNS MX record is switched first, then new mail arrives at Office 365 and unless the sync is two way, users still pointed to the old Exchange server won't see new mail.
If it was done the opposite, Office clients pointed to Office 365 first, then DNS switched, users not switched as yet would see no change, and those switched to Office 365 would see a delay (mail would go to the on-prem Exchange server first, then to Office 365 via sync), but everyone would be seeing new mail. I'm assuming here that the sync to Office 365 is continuous.
Thoughts? Is there anything I'm not understanding in the way this works?
Guides talk about cut-over migrations occurring over days, but I don't see that happening if users can't receive new mail.
Thanks,
Jim.
Is the mailbox sync in the migration batch one way to office 365 or two way (mail received at Office 365 ends up on the Exchange server)?
Reason that I'm asking is that all the guides I found show switching the DNS to Office 365 before clients are switched. It seems to me that this is backwards and you'd want to switch the clients first, then the DNS MX record as the final step.
If the DNS MX record is switched first, then new mail arrives at Office 365 and unless the sync is two way, users still pointed to the old Exchange server won't see new mail.
If it was done the opposite, Office clients pointed to Office 365 first, then DNS switched, users not switched as yet would see no change, and those switched to Office 365 would see a delay (mail would go to the on-prem Exchange server first, then to Office 365 via sync), but everyone would be seeing new mail. I'm assuming here that the sync to Office 365 is continuous.
Thoughts? Is there anything I'm not understanding in the way this works?
Guides talk about cut-over migrations occurring over days, but I don't see that happening if users can't receive new mail.
Thanks,
Jim.
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Exactly what I needed to know.
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Jim.