Exchange 2013 Setup fails with ” Database is mandatory on UserMailbox.”


Exchange 2013 setup fails with folowing error in Setup log :

11.05.2015 15:49:33.0205] [2] Preparing to output objects. The maximum size of the result set is “1”.

[11.05.2015 15:49:34.0049] [2] [WARNING] The object{bb558c35-97f1-4cb9-8ff7-d53741dc928c} has been corrupted, and it’s in an inconsistent state. The following validation errors happened:

[11.05.2015 15:49:34.0080] [2] [WARNING] Database is mandatory on UserMailbox.

[11.05.2015 15:49:34.0080] [2] [WARNING] Database is mandatory on UserMailbox.

[11.05.2015 15:49:34.0080] [2] Ending processing Get-Mailbox

[11.05.2015 15:49:34.0111] [2] Beginning processing Write-ExchangeSetupLog

[11.05.2015 15:49:34.0111] [2] Setting mailbox properties.


When running get-mailbox –arbitration we see that the some of the arbitration mailboxes are in inconsistent state or corrupted.

Additionaly they mey reside on exchange server which is no longer active.


Delete all 3 system mailboxes from User OU.

Delete Federation mailbox and Migration mailbox

Run setup /preparead /IacceptExchangeServerLicenseTerms in cmd for the folder were the exchange setup is located.

Mailboxes will be recreated.

Enable them with

Enable-Mailbox -Arbitration -Identity “FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042”

Enable-Mailbox -Arbitration -Identity “SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}”

Enable-Mailbox -Arbitration -Identity “SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}”

Enable-Mailbox -Arbitration -Identity “Migration.8f3e7716-2011-43e4-96b1-aba62d229136”

Set-Mailbox “Migration.8f3e7716-2011-43e4-96b1-aba62d229136” -Arbitration –Management:$true

There will be one more System mailbox which name can vary. Copy and paste the name in the enable-mailbox command to enable it.

User get-mailbox –monitoring to check if all the health mailboxes are OK.

If they are also corrupted. Delete them from the Microsoft exchange system Objects /monitoring and restart MSexchange Health Manager service to recreate them.

NOTE: In German this services is name “MSExchange -Integritaetsdienst” 😀

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