Exchange 2019 installation Failed hybrid environment

jennylee 86 Reputation points

I have an on-prem exch 2016 hybrid (on server 2012 r2 standard). All mailboxes are on O365. I'm setting up a new exch 2019 (server 2019 standard) so I can then get rid of 2016. It gets stuck on Step 8/12 Mailbox service. The system mailboxes are all there, but the homeMDB attribute, has the 2016 server DB in it.

Do I need to change it?

It appears every time I try to reinstall it, that it creates another DB.

I ran all the initial setups:

\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareSchema

,\setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAD /OrganizationName

.\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAllDomains

Any ideas?

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Accepted answer
  1. Amit Singh 4,876 Reputation points

    In my research, it may be related to the discovery system mailbox. So please check if it exists in "Users" OU.
    If existing, please check the attribute "homeMDB", and ensure that it has a valid value the same as another system mailbox.

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

    If anything is 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 the issue persists.
    You could refer to this similar case and this blog, Setup a New Exchange 2019 Server.

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  1. Pahan Mandara 0 Reputation points

    Does Anyone know how to fix this issue? 😢Screenshot 2024-04-25 153550

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