After migrating from Exchange 2003 to Exchange 2010 you may get this alert in SCOM “Transaction failures occurred during MAPI connectivity testing”

Transaction failures occurred during MAPI connectivity testing.
Some of the MAPI connectivity transactions failed. Detailed information:
Target: System mailbox for SERVER\Public Folder Database
Error: [Microsoft.Exchange.Data.Storage.ObjectNotFoundException]: The Active Directory user wasn’t found.

This alert comes from the Exchange 2010 Management Pack. The test is being done through this  powershell cmdlet “Test-MAPIConnectivity”. To further investigate this problem we log into the Exchange 2010 server and run the same command in Exchange 2010 powershell command line manually, and yes we get the same error:

to solve this issue open ADSI Edit and remove the whole old Exchange 2003 container called “Servers”. after doing this return to the Exchange 2010  server and rerun the cmdlet, you will see that it runs with no errors.