Solving the error message "The local computer is not a possible owner of the clustered mailbox server " during Setup /UpgradeCMS
Hello Folks,
If you are experiencing this following error message "The local computer is not a possible owner of the clustered mailbox server" after running Setup /UpgradeCMS. There a couple of solutions to fix it.
One of the possible solutions is:
- Open AdsiEdit.msc
- Expand Configuration / Services / Microsoft Exchange / <Organization Name> / Exchange administrative Group / Servers
- Right click on <CMS Server>
- Locate the attribute msExchServerRedundantMachines and add the second node (a comma is required between nodes)

Click on the picture to enlarge
Now wait this new attribute replication among your DCs and run again Setup /UpgradeCMS.
Best Regards,
Anderson Patricio
Powered by Zoundry