Would like to know what this MBX means on the following report

Chakil Jaifar 21 Reputation points

Good day,

I would like to know what MBX means on this report and why it is on 0 different from the others on the same environment.


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.
6,490 questions
0 comments No comments
{count} votes

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  1. Kael Yao-MSFT 26,391 Reputation points Microsoft Vendor

    Hi, @Chakil Jaifar

    I tested the script in my lab.
    If currently no database is mounted or no database copy is active on the dag member server, the report will show mailbox count as 0.
    It seems to be the normal behavior.

    Does EXDAG-01 only host passive database copies on it?
    If so, you don't need to worry about that.

    There are DBs mounted always because the 4 servers are in DAG so I would like to know why is this happening since it must balance all the work between all of them.
    A database is always active on a specific member service of DAG and other servers will only host the passive copy of the database ( and the copy would not be mounted unless a switchover is performed or a failover occurs)

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  1. Ashok M 6,466 Reputation points

    Hi @Chakil Jaifar ,

    MBX in this report means the number of mailboxes (958+1668+0+700 = 3326) which is mentioned in the top left.

    0 means that server doesn't host any mailboxes or it could be possible that it has only replicas or it has a different server role. To provide more details, please share the script and the exchange server details by covering your personal information.

    If the above suggestion helps, please click on "Accept Answer" and upvote it.