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Exchange Server 2013 CU5 to CU6 upgrade fails and when I looked into my ExchangeSetupLogs I found below error which says arbitration mailbox is missing.

Get-Mailbox –Arbitration command gave a warning message that “Database is mandatory on UserMailbox.”

Resolution:

Setting home database to the Arbitration mailbox fixed the issue.

Get-Mailbox -Arbitration | Set-Mailbox -Arbitration -Database MyDB01

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