Migrating from office 365 to on-premises Exchange server

Question

Migrating from office 365 to on-premises Exchange server

Zeeshan Butt 21

Dear Migration expert,

When migrating a mailbox from office365 back to On premises. i would like to know what would be the value for target address in mail contact in office365. My dns is pointing to Office 365 and i don't want to change anything in it. Once migration is completed office365 mailbox is converted to mail contact with target address which is used for routing a mailbox to on-premises. What is best standard policy for this without changing DNS migrated mailbox should be directed to on-premises.

Regards,

Zeeshan

Joyce Shen - MSFT 16,701 Reputation points

2022-03-21T07:01:36.73+00:00

Hi @Zeeshan Butt

Do suggestions below help and do you have any other concern about this question?

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Joyce Shen - MSFT 16,701 Reputation points

2022-03-25T05:39:31.713+00:00

Hi @Zeeshan Butt

I am writing to see how everything is going on with this thread. If you still have further concern on this, please feel free to let us know.

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Joyce Shen - MSFT 16,701 Reputation points

2022-03-30T07:07:02.683+00:00

Hi,

What about try enabling the ExcludeExplicitO365Endpoint registry key under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover for on-prem users?

Refer to this: Unexpected Autodiscover behavior when you have registry settings under the \Autodiscover key

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Zeeshan Butt 21 Reputation points

2022-04-04T05:31:40.847+00:00

no dear this did not work as well.

Thanks
Joyce Shen - MSFT 16,701 Reputation points

2022-04-07T08:26:43.263+00:00

Hi,

I'm afraid you will need to change your autodiscover record to point to on-prem
Autodiscover URL in Exchange hybrid deployment

1 answer

Your answer

Joyce Shen - MSFT 16,701 Reputation points

2022-03-21T07:01:36.73+00:00

Hi @Zeeshan Butt

Do suggestions below help and do you have any other concern about this question?

If an Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Joyce Shen - MSFT 16,701 Reputation points

2022-03-25T05:39:31.713+00:00

Hi @Zeeshan Butt

I am writing to see how everything is going on with this thread. If you still have further concern on this, please feel free to let us know.

If an Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Joyce Shen - MSFT 16,701 Reputation points

2022-03-30T07:07:02.683+00:00

Hi,

What about try enabling the ExcludeExplicitO365Endpoint registry key under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover for on-prem users?

Refer to this: Unexpected Autodiscover behavior when you have registry settings under the \Autodiscover key

If an Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Zeeshan Butt 21 Reputation points

2022-04-04T05:31:40.847+00:00

no dear this did not work as well.

Thanks
Joyce Shen - MSFT 16,701 Reputation points

2022-04-07T08:26:43.263+00:00

Hi,

I'm afraid you will need to change your autodiscover record to point to on-prem
Autodiscover URL in Exchange hybrid deployment

Answer 1

The target address in 365 would be an accepted domain in on-prem Exchange.
This isnt about DNS, it would be how you have your accepted domains configured in Exchange Online

So for example:

If your domain is contoso.com, you would have that set in both on-prem and in Exchange Online.

In Exchange Online , ensure contoso.com is set as an internal relay:

https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/manage-accepted-domains/manage-accepted-domains

Internal relay (also known as non-authoritative): Recipients for this domain can be in Microsoft 365 or Office 365 or your own email servers. Email is delivered to known recipients in Office 365 or is relayed to your own email server if the recipients aren't known to Microsoft 365 or Office 365.

Also ensure you have a connector between Exchange Online and on-prem ( You probably already do)

If you select this option, you must create a connector for mail flow from Microsoft 365 or Office 365 to your on-premises email server; otherwise recipients on the domain who are not hosted in Microsoft 365 or Office 365 won't be able to receive mail on your own email servers. For more information about setting up connectors, see Set up connectors to route mail between Microsoft 365 or Office 365 and your own email servers.

Thats it! Messages sent to on-prem mailboxes will then get correctly routed.

Zeeshan Butt 21 Reputation points

2022-03-25T10:47:22.683+00:00

Hi Andy,

Thanks for your answer. Andy actually i am stuck in connectivity of outlook for those user which are migrated from office365 to onPrem. Lets say i have domain contoso.com and it is configured in on-prem and in Exchange online as accepeted domain. User are migrated fine without any issue user on office365 is converted to mail user with target delivery domain hc-contoso.com. DNS still pointing to offce365 along with SRV record. In this case its keep asking for user name and password in outlook because user is already migrated to onprem and in office365 it is converted to mail user with target delivery domain.

I ran this command
Get-Mailbox -Identity “mailbox you want to move back to onprem” | New-MoveRequest -OutBound -RemoteTargetDatabase “name of your onprem database” -RemoteHostName “name of your hybrid connection” -RemoteCredential $opcred -TargetDeliveryDomain “your target delivery domain”

If concern about this targetdeliverydomain if i use contoso.com its keep asking for password and dont take me to onpremises server how it can easily route to onpremises.

Regards,

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Migrating from office 365 to on-premises Exchange server

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