Mailbox type is unable to change from user to office365 in the on-premises exchange portal.

Question

Mailbox type is unable to change from user to office365 in the on-premises exchange portal.

Diana Piloya 185

The mailbox type in Online Exchange Admin Center is user mailbox. though would like the mailbox type in the on-premises exchange portal to switch from user to office365.

Hung-Chun Yu 981 Reputation points Microsoft Employee Moderator

2023-11-14T18:01:41.1733333+00:00

Hi @Diana Piloya

Thank you for contacting Protocol support. It appeared your question does not fall under guidelines outlines under https://aka.ms/openspecs. I am removing [Exchange Server Open Specifications] tag from the post.

Hung-Chun Yu

Microsoft Open Specifications Support.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2023-11-22T08:10:20.1833333+00:00

Hi @Diana Piloya ,

Just checking in to see if the answer helped. If this answers your query, please don’t forget to click "Accept Answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Answer accepted by question author

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Hung-Chun Yu 981 Reputation points Microsoft Employee Moderator

2023-11-14T18:01:41.1733333+00:00

Hi @Diana Piloya

Thank you for contacting Protocol support. It appeared your question does not fall under guidelines outlines under https://aka.ms/openspecs. I am removing [Exchange Server Open Specifications] tag from the post.

Hung-Chun Yu

Microsoft Open Specifications Support.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2023-11-22T08:10:20.1833333+00:00

Hi @Diana Piloya ,

Just checking in to see if the answer helped. If this answers your query, please don’t forget to click "Accept Answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Answer 1

Hi @Diana Piloya ,

The mailbox type in Online Exchange Admin Center is user mailbox. though would like the mailbox type in the on-premises exchange portal to switch from user to office365.

From the description, do you mean for some reason this user has mailbox in both Exchange Online and on-premises? If this describes your situation, it's recommended to follow the instructions provided in the article below to try correcting this.
How to recover when a mailbox exists in both Exchange Online and on-premises

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Answer 2

Manish Tiwari 190

To change a user mailbox to an Office 365 mailbox in the on-premises Exchange portal, you typically need to perform a mailbox migration from your on-premises Exchange server to Exchange Online. This process is part of Office 365 Hybrid Configuration and involves several steps:

Hybrid Configuration: Ensure that you have a hybrid deployment set up between your on-premises Exchange and Office 365. This involves configuring Exchange Federation and possibly Active Directory Federation Services (AD FS).

Mailbox Migration: Use the Exchange Admin Center (EAC) or Exchange Management Shell to initiate a mailbox migration to Office 365.

Synchronization: Make sure that Azure AD Connect (or a similar tool) is running to synchronize your on-premises Active Directory with Azure AD.

Complete the Migration: After the migration, the mailbox type should change to Office 365 in your on-premises Exchange portal.

Diana Piloya 185 Reputation points

2023-11-15T08:09:40.0166667+00:00

@Manish Tiwari I have already done the migration of the users under hybrid configuration though the mailbox type has failed to change from user` to `office365` though the users` mailbox is visible from exchange online portal.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2023-11-16T07:29:06.02+00:00
Hi @Diana Piloya ,

Run the command below on both on-prem and Exchange online, check if the guid returned are the same.

Get-Mailbox <useridentity> | fl *ExchangeGUID*

If yes, you can refer to the link in my reply earlier to recover from the current situaiton.
Diana Piloya 185 Reputation points

2023-12-11T05:45:49.51+00:00

@Manish Tiwari I have completed the migration though the mailbox type is still user instead of office 365 in the on-premises exchange portal. Is there a way I can change this.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2023-12-14T08:52:19.26+00:00

Hi @Diana Piloya ,

What does the aforementioned command say?
Diana Piloya 185 Reputation points

2023-12-14T11:47:29.67+00:00

Hi @Yuki Sun-MSFT let me run the command and get back to you.
Diana Piloya 185 Reputation points

2023-12-14T13:59:35.13+00:00

@Yuki Sun-MSFT I run the command and the GUID on both exchange on-prem and exchange online are the same. how do i then change mailbox type from user to 365?
Yuki Sun-MSFT 41,456 Reputation points Moderator

2023-12-15T05:45:05.8766667+00:00

Hi @Diana Piloya ,

Back up the mail data of the on-prem mailbox and then manually enable the remote mailbox for it after disabling the on-prem mailbox. Follow the steps of Scenario in the link I mentioned in my previous reply:
https://learn.microsoft.com/en-us/exchange/troubleshoot/user-and-shared-mailboxes/mailbox-exists-exo-onpremises#scenario-1-keep-exchange-online-mailbox

Here's one similar post for your reference: Need to change mailbox type in hybrid Onperm exchange

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Mailbox type is unable to change from user to office365 in the on-premises exchange portal.

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