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Exchange 2016 install Error: Database is mandatory on User Mailbox

Posted by viralr on December 16, 2016

Exchange 2016 install Error: Database is mandatory on User Mailbox

The following error was generated when “$error.Clear();
if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) )
Update-RmsSharedIdentity -ServerName $RoleNetBIOSName
” was run: “Microsoft.Exchange.Data.DataValidationException: Database is mandatory on UserMailbox.
at Microsoft.Exchange.Data.Directory.ADDataSession.Save(ADObject instanceToSave, IEnumerable`1 properties, Boolean bypassValidation)
at Microsoft.Exchange.Data.Directory.Recipient.ADRecipientObjectSession.Save(ADRecipient instanceToSave)
at Microsoft.Exchange.Management.Deployment.UpdateRmsSharedIdentity.Link()
at Microsoft.Exchange.Management.Deployment.UpdateRmsSharedIdentity.InternalProcessRecord()
at Microsoft.Exchange.Configuration.Tasks.Task.b__b()
at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)”.

Resolution: The above error “Database is mandatory on UserMailbox” states that “one of the system mailbox on the server is not having a Database” so to check which system mailbox is not having database please use below command

Get-mailbox -Arbitration | Format-Table Name, ServerName, Database -Auto


As you can see ,The command will display orphand mailbox which does not have database

Also see the below command which shows system mailbox on decommissioned server ‘viral-mbx02’

[PS] C:\Windows\system32>Get-Mailbox -Arbitration |ft Name, Servername

Name ServerName

—- ———-

SystemMailbox{1f05a927-0695-4348-bb62-d2369dcb23d5} viral-mbx01

FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 viral-mbx01

SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} viral-mbx02

SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} viral-mbx02

Migration.8f3e7716-2011-43e4-96b1-aba62d229136 viral-mbx02

Now we will disable all of those mailboxes which present on viral-mbx02 server since viral-mbx02 server is already decommisioned long ago.

Now to disable that mailbox use below command

Disable-Mailbox “SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}” -Arbitration -DisableLastArbitrationMailboxAllowed

Now to remove database from server which is already decommissioned use following commands,

Get-MailboxDatabase -Server viral-mbx02

Name Server Recovery ReplicationType

—- —— ——– —————

Mailbox Database 0912423282 viral-MBX02 False None

[PS] C:\Windows\system32>Remove-MailboxDatabase “Mailbox Database 0912423282”

Following article contains more info and fix to disable arbitration mailboxes.



Please feel free if you have any further question and I will be happy to help


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