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Sivachandran_Palani's avatar
Sivachandran_Palani
Copper Contributor
Nov 15, 2023

Mail Contact showing as UserMailbox in Exchange Online

In a Hybrid environment, mail contact is created in Exchange Onprem and it is syncing in Exchange Online as "User Mailbox"

 

The Proxy address settings are not getting synced, please advice what could be the issue?Showing as contact in Onpremsyncing as mailbox in online

  • Hello, Sivachandran_Palani 

     

    welcome to the Microsoft community, my name is Recep I'll be happy to help you today.

     

    If you are facing an issue where a mail contact created in Exchange On-Premises is syncing in Exchange Online as a "User Mailbox" instead of a mail contact, there are a few steps you can take to troubleshoot and resolve the problem. Here's a step-by-step guide:

     

    Check the Recipient Type of the Object:

    In Exchange Online PowerShell, run the following command to check the recipient type of the object:

     

    Verify the Mail Contact in On-Premises Exchange:

    In your on-premises Exchange environment, run the following command to verify that the mail contact is indeed created as a mail contact.

     

    Check Sync Status:

    Ensure that the Azure Active Directory (AAD) Connect sync is running successfully and has synchronized the changes from on-premises to the cloud. You can check the synchronization status using the AAD PowerShell module.

     

    Force Synchronization:

    You can force a synchronization from the AAD Connect server. Open a PowerShell prompt on the   server where AAD Connect is installed and run the following commands:

     

    Examine Attributes

    Check the attributes of the mail contact in both on-premises and online environments. Ensure that the necessary attributes such as RecipientType, RecipientTypeDetails, and RemoteRecipientType are set correctly.

     

     

     

    If I have answered your question, please mark your post as Solved

    If you like my response, please give it a Like :smile:

    Appreciate your Kudos! Proud to contribute! ğŸ™‚

     

    • Sivachandran_Palani's avatar
      Sivachandran_Palani
      Copper Contributor
      Hi Recep_Gencaslan695, Ran the script in on-prem and it didnt't give any results. Checked again in ECP and found it is not a Mail contact it is created as "Mail User". So if it's created as Mail user and licensed added will it sync as mailbox to exchange online? If Yes why the changes in primary SMTP are not getting changed in online? Any steps to check on this further?
      • Dan_Snape's avatar
        Dan_Snape
        Steel Contributor
        It sounds like an issue with the AAD connect sync for this object, you'll need to check the logs to see why. Is this an admin account at all?
  • Dan_Snape's avatar
    Dan_Snape
    Steel Contributor
    Have you given the mail user and license in Office 365? That would explain the mailbox in Exchange Online
    • Sivachandran_Palani's avatar
      Sivachandran_Palani
      Copper Contributor
      Hi Dan, Yes license is assigned to user, will try removing it and update here about the outcome

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