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SaiManasaChintakunta-1623 avatar image
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SaiManasaChintakunta-1623 asked LucasLiu-MSFT commented

Office 365 mailbox has guid different than on-prem mailbox

Hi,

We have a issue where we enabled remote mailbox for user and it doesn't populate in Office 365. We have this message "We are preparing mailbox for this user" message in office 365.

We again disabled the remote mailbox, wait for 2 syncs, enable the mailbox, wait for the sync, set archive guid and then i left it for entire day and magically the mailbox appeared in Office 365.

But a new problem started as the guid of Office 365 mailbox is different than On-prem mailbox. I tried various ways to connect both of them and was not successfully.

Any suggestion would be appreciated.

Thank you.

office-exchange-server-administration
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1 Answer

LucasLiu-MSFT avatar image
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LucasLiu-MSFT answered LucasLiu-MSFT commented

Hi @SaiManasaChintakunta-1623 ,
Is your environment a Exchangne hybrid deployment environment?

According to your description, do you mean that the same AD account has both an on-premises Exchange mailbox and an O365 mailbox? If so, based on my knowledge this is not feasible. It will create mail flow issues. Please following the steps in the below link to recover. In order to protect the mailbox data, please backup the mailbox before operation.

Please refer to: How to recover when a mailbox exists in both Exchange Online and on-premises and My user has a mailbox both on-premises and in Exchange Online. Help!



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Hi @LucasLiu-MSFT ,

Thank you for your reply.

Yes we are in hybrid environment. According to my understanding, the office 365 mailbox is not syncing with on-premise AD and hence it created a new mailbox after enabling the remote mailbox in on-prem. On on-prem it is showing as a remote mailbox but with different exchange guid and in office 365 it shows user mailbox wit different guid.

As users wants his data, my be connecting this old guid to new guid would resolve the issue. But I'm not sure if it is possible.

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LucasLiu-MSFT avatar image LucasLiu-MSFT SaiManasaChintakunta-1623 ·

Hi @SaiManasaChintakunta-1623 ,
According to your situation, you could use hard match to match the on-premiese GUID value with the immutableID in the cloud. For the specific steps you could refer to the following article: Soft (SMTP) vs. Hard (immutableID) matching with Azure AD Connect
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.



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Hi @SaiManasaChintakunta-1623 ,
Do suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.



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Hi @SaiManasaChintakunta-1623 ,
I am writing here to confirm with you how thing going now?




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Hello, It is still not resolved. I'm trying to check this with my senior colleagues and if not helped i will reach Microsoft for help.

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LucasLiu-MSFT avatar image LucasLiu-MSFT SaiManasaChintakunta-1623 ·

Hi @SaiManasaChintakunta-1623 ,
Looking forward to your good news.



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