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Mailbox type is unable to change from user to office365 in the on-premises exchange portal.
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.
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.
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Hi @Diana Piloya ,
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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.
@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.
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.
@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.
Hi @Diana Piloya ,
What does the aforementioned command say?
Hi @Yuki Sun-MSFT let me run the command and get back to you.
@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?
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://video2.skills-academy.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
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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