"Resource ‎'CiAgeOfLastNotification‎(System)‎‎' is unhealthy and shouldn‎'t be accessed" error when you try to move a mailbox

Applies to: Exchange OnlineExchange Server 2016 Enterprise EditionExchange Server 2016 Standard Edition


When you try to offboard or move a mailbox, you get the following error message:
Error: Resource ‎'CiAgeOfLastNotification‎(System)‎‎' is unhealthy and shouldn‎'t be accessed
You experience these symptoms in one of the following scenarios:
  • You have a hybrid deployment of on-premises Exchange Server and of Exchange Online and you try to move a mailbox from Exchange Online to the on-premises environment.
  • You try to perform a cross-forest mailbox move between two on-premises Exchange servers.


This issue can occur if an index in the on-premises environment is corrupted.


To resolve this issue, follow these steps:
  1. Rebuild the content index catalog on the on-premises Exchange server. For more info about how to do this, go to Reseed the Search Catalog.
  2. After the index catalog is rebuilt, wait a few minutes until the fast engine starts indexing again.
  3. Determine whether indexing is completed. To do this, run the Get-MailboxDatabaseCopyStatus cmdlet.

    If indexing is completed, the value in the output should show as Healthy.
After indexing is completed, perform the mailbox move request.


For more info, see the following Microsoft resources:
Still need help? Go to Microsoft Community or the Exchange TechNet Forums.