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Unable to update pre-migration meeting requests after migration to Office 365

We recently migrated from Exchange 2010 to Office 365.  At the same time, we changed our naming structure from last name, first name to first name, last name.

The naming change may have been more significant than the migration to 365.  

My problem is this:  I have staff who have meeting requests with internal and external people from before migration to 365.  While the meeting requests migrated successfully, the meeting owner's ability to edit or change the meeting has been lost.  Even though the account owner's email address is the same, the name order change may have severed the relationship to the object.

When the person tries to update a meeting, he gets the following NDR:
 
            Your message did not reach some or all of the intended recipients.
 
                  Subject:      In-Person Meeting
                  Sent: 8/15/2016 3:36 PM
 
The following recipient(s) cannot be reached:
 
      Person01 on 8/15/2016 3:36 PM
            This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].
 
      Person02 on 8/15/2016 3:36 PM
            This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].

The NDR is implying that the very person who sent the original meeting request no longer has permission to update his meeting request.  I attribute this to both the name order change and the migration from 2010 to 365.  

I'd appreciate any suggestions for this issue.
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APPA_IT_Staff
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APPA_IT_Staff
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1 Solution
 
Adam BrownSr Solutions ArchitectCommented:
This happens when the Legacy Exchange DN is not added to the mailboxes in Office 365 during the migration. How did you complete the migration process?
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APPA_IT_StaffAuthor Commented:
I didn't perform it personally, but there were complications as we started out as a ProPlus 365 customer first - and then upgraded to enterprise.  This turned out to be messy requiring deleting and re-adding the users on the 365 side.  Then, when we decommissioned the Exchange server (properly instead of just turning it off) again there was a deletion and re-addition and copying over of the Exchange attributes (because we were already syncing the AD objects).  I may not be explaining it well, since I only have a limited understanding of the process, but I know that it had bumps in the road either because the path is inherently bumpy - or we made bad choices.
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Adam BrownSr Solutions ArchitectCommented:
Ok. Check each of the accounts' email addresses. If there is no x.500 address listed, that is the root of your problem with the meeting permissions. X.500 addresses are used by Exchange for communication on the back-end (between exchange servers) rather than the typical email address, and all calendar events are written with an ACL that includes the sender's x.500 address as the owner and the recipient's x500 as a secondary.

If the Exchange server was decommissioned by removing all exchange attributes from the user accounts, the attribute that holds the LegacyExchangeDN value (which translates into the x.500 address) is probably gone, but check to see if it's still there on your user accounts. If it is still there, add the whole string to the proxyAddresses attribute in a test case using this format:
X500:<legacyexchangedn>

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That should reconnect the permissions as needed. However, if the legacyexchangeDN is not on any of the accounts, you won't be able to recover easily, since that value is randomly generated at mailbox creation time.
1
 
Adam BrownSr Solutions ArchitectCommented:
User upvoted, but no further response to determine if this resolved the issue. Generally, though, this issue is caused by missing x.500 addresses.
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