Arbitration mailbox

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Issue:Arbitration Mailbox Issue During Exchange 2016 to 2019 Migration.Environment Overview:Mixed Exchange environment:Exchange 2016: EX1-16, EX2-16, DR1-16, DR2-16Exchange 2019: EX1-19, EX2-19Currently migrating mailboxes from Exchange 2016 to Exchange 2019.Issue Description:One system mailbox was found on an orphaned Exchange server and i removed manually.Post-removal, errors were observed related to the Migration and Federation arbitration mailboxes.Both mailboxes appeared under the User container but were not functioning correctly.A user-type mailbox with the display name “Migration” appeared. I thought this may cause issue with arbitration mailboxes.Remediation Steps Taken:Removed the user-type mailbox with the display name “Migration.”Manually removed both FederationMailbox and MigrationMailbox objects.Verified that the Exchange Trusted Subsystem has correct permissions on the Microsoft Exchange Security Objects (MSEO) container.Executed Setup.exe /PrepareAD, Its Re-created the Federation and Migration related users.Executed the following command to enable the arbitration mailbox:Enable-Mailbox -Identity &lt;GUID-of-MigrationMailbox&gt; -Arbitration (command executed successfully).Current Problem:Despite successful execution of the Enable-Mailbox command, the msExchRecipientTypeDetails attribute is not updating to the expected value. Current value: 8388608 and display name &nbsp;also looks wrong because its show “Microsoft Exchange Approval Assistant” seems to be incorrectly tied to the migration mailbox.This issue is preventing proper functionality of the migration mailbox, and as a result, the remaining mailboxes cannot be moved from Exchange 2016 to Exchange 2019.

anntaeyoun · Answer

Please result value view after below command run!
Get-Mailbox -Arbitration |&nbsp; fl Name,DisplayName,Alias,RecipientTypeDetails,ExchangeGuid,Database,OrganizationalUnit,WhenChangedUTC

zohaib_yousuf · Answer

Hi,Run the following commands to identify system and arbitration mailboxes, and then migrate them to the Exchange 2019 mailbox database.Get-Mailbox -Arbitration | ft Name,ServerName,DatabaseGet-Mailbox -Database "DB01" -ArbitrationGet-Mailbox -Database "DB01" -Arbitration | New-MoveRequest -TargetDatabase "DB02"

manishvkg · Answer

Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Microsoft ExchangeRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : 9f7bd9cd-71d7-4133-8c69-5c5314e9ba1fOrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 8/12/2025 6:54:03 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemDBServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcex1Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemMailbox{1f05a927-3a2a-4c38-aedb-b486f676d459}DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Microsoft Exchange Approval AssistantRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : 1c60f4b2-2001-4397-a1ee-599727852fb3OrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 7/9/2025 9:32:41 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemDBServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcex1Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Microsoft ExchangeRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : 76a5a9e8-a43f-440e-8d96-5da3afa97b4bOrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 10/14/2025 10:37:11 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemDBServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcex1Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemMailbox{D0E409A0-AF9B-4720-92FE-AAC869B0D201}DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: E4E Encryption Store - ActiveRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : 2acaeee7-0857-4bbe-9c9f-ab8fa5e5b853OrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 7/9/2025 9:32:41 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemDBServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcex1Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemMailbox{2CE34405-31BE-455D-89D7-A7C7DA7A0DAA}DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Microsoft ExchangeRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : e459e424-54cb-4627-b9a2-126181bd5c89OrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 7/9/2025 9:32:41 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : SystemDBServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcex1Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : Migration.8f3e7716-2011-43e4-96b1-aba62d229136DisplayName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: MigrationRecipientTypeDetails : ArbitrationMailboxExchangeGuid &nbsp; &nbsp; &nbsp; &nbsp; : eb631bec-b8b2-41f8-acc7-8ec714f00145OrganizationalUnit &nbsp; : abc.bh/UsersWhenChangedUTC &nbsp; &nbsp; &nbsp; : 10/15/2025 7:53:01 AMDatabase &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : DB_SystemServerName &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : abcmail1

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Arbitration mailbox

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