error Exchange 2013 Mailbox role fails stating to upgrade the discovery mailboxes to R5 version

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I was doing installation of second Exchange Server 2013 Mailbox Role for my DAG (Production) today and got this error. This error reminded me my Microsoft Exchange PSS days.

I have seen this error before when exchange server 2010 was RTM.


After reading different articles, I was able to resolve this issue by performing the following steps:

  1. open up ADSIEDIT.msc
  2. Open the Default Naming Context
  3. Locate the Users container
  4. Go to the properties of a 2010 user acount and locate the value that is set in the homMDB attribute. Make a copy of the contents that are set in that attribute
  5. Locate the CN=DiscoveryMailbox Search and go to properties
  6. In the homeMDB attribute paste in the value that was copied from the regular 2010 user account
  7. Repeat step 6 for the following system mailbox CN=SystemMailbox{1f05a927-30df-4fe0-8a40-136e6d78e2d1}
  8. Repeat step 6 for the following system mailbox CN=SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}

After updating the homeMDB value for the Discovery and two System Mailboxes restart the Information Store.

and it works now Open-mouthed smile


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