Exchange Administration Center (Exchange 2016 on-premise) not showing some mailboxes

EduardCJ 21 Reputation points
2021-09-21T11:57:51.313+00:00

We have recently migrate a Exchange 2010 to a Exchange 2016 (on-premise). The migration process was succesfull but some weeks after finish this migration we have detected that some mailboxes aren't visible from the list showed by th Exchange Administration Center. Indeed, we have a total of 440 mailboxes but EAC show only 376 mailboxes.

In other hand, we can manage this "hidden" mailboxes through EMS with no problem and, if we execute some scripts to control the total amount of mailboxes we can see them. In addition, this mailboxes ara completly operative.

We have followed the solution showed here https://social.technet.microsoft.com/Forums/en-US/25bd106f-1d51-4cfb-afac-657d569c4efc/recovered-mailbox-not-showing-in-ecp-but-it-works?forum=exchangesvradmin but these mailboxes aren't yet visible from EAC.

Have anybody any idea how to fix this?

Thanks in advance

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Andy David - MVP 145K Reputation points MVP
    2021-09-21T12:28:30.483+00:00

    Yes, if they are shared, then you wont see them under the Mailboxes menu, but you will under Recipients/Shared

    To Convert:

     Get-Mailbox <SampleUserYoucantSeeinEAC> | set-mailbox -Type Regular
    

    To convert all of them in bulk

    Get-Mailbox -RecipientTypeDetails Shared | Set-Mailbox -Type Regular
    

    After that you will be able to see them in EAC under Mailboxes

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  1. Andy David - MVP 145K Reputation points MVP
    2021-09-21T12:09:08.507+00:00

    What are the recipient types of the ones you can't see?

    Get-Mailbox <SampleUserYoucantSeeinEAC>  |FL *recipienttype*