Error While Deleting The Default Mailbox Database In Exchange 2010…

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When an Exchange 2010 mailbox role is installed, a default mailbox database is created. In Exchange 2007, the default database is named “Mailbox Database” whereas in 2010, it comes with a random numbering at the end of the “Mailbox Database” name. This is to make the mailbox database name unique. Mine is named “Mailbox Database 1697561822”.


As most of the admins, my first instinct is to remove the default database and create ones with my company’s naming convention or the names of my choice. I created a new database named “MD1” and tried deleting the default one, only to be greeted with the error below.

“This mailbox database contains one or more mailboxes or arbitration mailboxes. Before you can remove this mailbox database, you must disable, move or remove user mailboxes and move arbitration mailboxes.

Arbitration Mailbox Error

Technet explains arbitration mailboxes as the mailboxes used for managing approval workflow. For example, an arbitration mailbox is used for handling moderated recipients and distribution group membership approval.

I moved my user mailboxes to another database and ran the following command to find the arbitration mailboxes.

Get-Mailbox –Database “Mailbox Database 1697561822” –arbitration

Find Arbitration Mailboxes

I moved the arbitration mailboxes as well to the second database with the command below.

Get-Mailbox –Database “Mailbox Database 1697561822” –arbitration | New-MoveRequest –TargetDatabase MD1

Arbitration Mailbox Move

I confirmed that the arbitration mailboxes were successfully moved using the Get-MoveRequest cmdlet.

Arbitration Move Complete

Once the mailbox move was completed, I could delete my default database!

MBX After

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About the author: UC Architect, Blogger, Husband & Dad. I have been in IT for the last 12 years, with Exchange Server becoming the prime area in the last few years. I am active on Experts Exchange & TechNet forums and I am a technical author for SearchExchange.

12 comments… add one

  1. Anonymous

    Very helpful information!

  2. Alex

    YOU ROCK!!!


  3. There is no space between your – and tatgetdatabase command. I know its just a type here but the steps are great except this.

    1. Rajith Enchiparambil

      Thanks Bill.

      I have updated the article.

  4. Jerry

    Thank you so much. Really helpful. Just the information I was looking for.

    1. Thanks Jerry.

  5. aron

    yeah, so helpful. But i think Microsoft should make it simple for administrators. They always do as if everybody have enough time to surf internet.

    1. Rajith Jose Enchiparambil

      Good point Aron ;)

  6. dinesh

    Hi ,
    I am not facing the above issue , But I was cross checking to run above command nothing is showing to me.

    Get-Mailbox –Database “Mailbox Database 1791121752”

    1. Rajith Jose Enchiparambil

      Hi Dinesh,

      Have you moved the arbitration mailboxes as well? Run Get-Mailbox –Database “Mailbox Database 1791121752” -Arbitration to find out.


  7. Mahmoud Badran

    Got again erroe ” mailbox database ‘#LONGHASHCODE#’ is offline”

    is there any other resolution?

    1. Rajith Jose Enchiparambil

      Hi Badran,

      Can you copy & paste the command you are running and the full error please?


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