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I previously had Exchange 2010 (Windows Server 2008 R2 Standard) installed and two domain controllers 2008 and 2016. I have since removed the 2008 DC and 2010 Exchange Server and have a single 2016 controller.

I am currently in the process of installing Exchange 2019 (Microsoft Exchange Server 2019 Cumulative Update) on another box (Windows Server 2019) but the installation fails on step 8 of 12 (Mailbox role: Mailbox service).

I also get the below as part of the error message:

  • No RetentionPolicy assigned to E-Discovery arbitration mailbox currently, we need to set it here.

  • This can be remove after BUG(O15#2555914) is fixed.

I have a single Domain Controller (Windows Server 2016) and the Forest Functional Level set to Windows Server 2016

I am at a road block. Any suggestion to help me move forward?

Michael Downey
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1 Answers1

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In my research, it maybe related to the discovery system mailbox. Please check if it exists in "Users" OU.

If existing, please check the attribute “homeMDB” , ensure that it has a valid value same as other system mailbox.

Or run “Get-Mailbox -Filter { RecipientTypeDetails -eq "DiscoveryMailbox" } | fl name, database” to see if it returns any error.

If anything wrong, you could try to delete this system database, and recreate it by running "Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAD", then re-run the setup wizard and check if issue persists.

You could refer to this similar case.

Shaw Lu
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