After the correct updates have finally been released last week (Exchange 2010 SP3 and Exchange 2013 CU1) it was time to get some Guinea Pigs… sorry, “Test Users” migrated over to Exchange 2013. Some of the very small mailboxes were fine, but when it came to a real users mailbox the progressed appeared awfully slow. After taking a look at the log, I found it was full of: The job is currently stalled due to ‘Content Indexing’ lagging behind on resource ‘CiAgeOfLastNotification()’