Solving the error message “The local computer is not a possible owner of the clustered mailbox server ” during Setup /UpgradeCMS

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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:

  1. Open AdsiEdit.msc
  2. Expand Configuration / Services / Microsoft Exchange / <Organization Name> / Exchange administrative Group / Servers
  3. Right click on <CMS Server>
  4. Locate the attribute msExchServerRedundantMachines and add the second node (a comma is required between nodes)

ocs- 0225.png
Click on the picture to enlarge

Now wait this new attribute replication among your DCs and run again Setup /UpgradeCMS.

Best Regards,
Anderson Patricio

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Written by Anderson Patricio

Anderson Patricio

Anderson Patricio is a Canadian MVP in Cloud and Datacenter Management, and Office Server and Services, besides the Microsoft Award he also holds a Solutions Master (MCSM) in Exchange and several other certifications. Anderson has been contributing to the Microsoft Community with articles, tutorials, blog posts, twitter, forums and book reviews. He is a regular contributor here at ITPROCentral.com, MSExchange.org, Techgenix.com and Anderson Patricio.org (Portuguese).