Archives for category: Exchange 2016

Ran into an issue migrating from Exchange 2010 to Exchange 2016 on premise. Two mailboxes got to 95% and stopped TransientFailureSource. Looking at the logs I found the error “Transient error MapiExceptionNotFound has occurred. The system will retry”.


I found that the Content Index Databases on the Destination Exchange 2016 DAG were failed and suspended. I got them healthy again and was able to repair the mailboxes on the Exchange 2010 MBX server by running this command in EMS

New-MailboxRepairRequest -Mailbox userIDĀ -CorruptionType SearchFolder, AggregateCounts, ProvisionedFolder, FolderView

To verify the repair had finished I created a new view on the Exchange 2010 Event Viewer with the following settings. Event ID 10048 confirmed it was complete


I then restarted the mailbox migration and everything completed successfully.



Today I setup two brand new Exchange 2016 Servers running CU6. Created IP-Less DAG and multiple databases. I noticed that the databases Content Index State was Failed. I tried the usual

Get-MailboxDatabaseCopyStatus * | where {$_.ContentIndexState -eq “Failed”}

Get-MailboxDatabaseCopyStatus * | where {$_.ContentIndexState -eq “Failedandsuspended”}

Get-MailboxDatabaseCopyStatus * | where {$_.ContentIndexState -eq “Failed”} | Update-MailboxDatabaseCopy -CatalogOnly

Get-MailboxDatabaseCopyStatus * | where {$_.ContentIndexState -eq “Failedandsuspended”} | Update-MailboxDatabaseCopy -CatalogOnly

NONE of those worked.


I changed the databases activation preferences from 1 to 2 on each of the hosting servers. Shortly after the databases began to crawl and then showed healthy.

Migrating users from an Exchange 2010 SBS server to Exchange 2016 I noticed that after one mailbox had completed the user was prompted to quit and restart outlook. But after the user did that nothing happened and their profile was still connected to the Exchange 2010 server. I tried to create a new profile but it wouldn’t complete giving me the infamous message

“Action cannot be completed. The connection to microsoft exchange is unavailable”

After double and triple checking my URL’s SCPs etc… I found that recycling theĀ “MSExchangeAutodiscoverAppPool” service on the Exchange 2016 Server resolved the problem.

  1. Open IIS on the Exchange 2016 Server
  2. Click on Application Pools
  3. Right Click on “MSExchangeAutodiscoverAppPool”
  4. Choose Recycle

You can either recycle the app pool each time you migrate a mailbox or check out the MS KB that guides you through setting it up to recycle every minute.