Exchange server the mailbox server role isn't installed on this computer

Ahmed Al-Takrouri 1 Reputation point
2021-10-14T08:35:10.497+00:00

Hello,

I have 2 DCs Windows Server 2019 (forest level 2016) & single node Exchange Server 2019 no CUs. Everything is stable including Exchange.

We want to upgrade to CU 8 and getting an error on checking prerequisites.

"The Mailbox server role isn't installed on this computer."

We run the setup directly without the 3 commands ( /PrepareSchema, /PrepareAD & /PrepareDomains). Once I take full backup for DCs and Exchange will run the commands and try again.

Did anyone faced similar issue and they got it working please assist.

Regards,

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,368 questions

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Andy David - MVP 142.3K Reputation points MVP
    2021-10-14T12:05:58.087+00:00
    0 comments
  2. Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor
    2021-10-15T01:29:06.703+00:00

    Hi @Ahmed Al-Takrouri

    Are the 2DCs in different sites?
    And is the DC with FSMO roles in a different site with the Exchange server?

    If it is the case, you may either run /PrepareSchema, /PrepareAD & /PrepareDomains commands in the site where the DC hosting FSMO roles locates and wait for the AD replication to complete.
    Or move the FSMO roles to the DC which is in the same site with the Exchange server.

    Anyway, it is recommended to run these commands first before you install a CU update.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.