Changing MX record in a Hybrid configuration

pozlu0 216 Reputation points
2021-02-26T20:45:30.413+00:00

Hello,
My company is moving from exchange 2010 to office 365.
Since now I have migrated 2500 mailboxes.
Now I would like to change the MX record pointing to office 365.
Its enought changing our dns or there are somo other configuration like
I have to rerun the hybrid configuration wizard?

Kind regards

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Andy David - MVP 143.8K Reputation points MVP
    2021-02-26T21:01:58.44+00:00

    No, you do not need to run the Wizard again.
    You can simply change the MX record

    https://learn.microsoft.com/en-us/exchange/decommission-on-premises-exchange

    Assuming that you have already moved all of the mailboxes to Exchange Online, you can point the MX and Autodiscover DNS records to Exchange Online, instead of to on-premises. For more information, see External Domain Name System records for Office 365.

    Make sure to update both the internal and external DNS, or you may have inconsistent client connectivity behavior.


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