I came across this event on an Exchange 2013 CU9 server which I was configuring for a customer.
Searching for solutions to this event made me understand that this is something that’s been going on since Exchange 2013 Cu7. The fix is quite simple and does not have any impact on the Exchange system.
Simply disable the Bitlocker check on the drive where diagnostics root directory exists.
Open below file in notepad (run as admin):
C:\Program Files\Microsoft\Exchange Server\V15\bin\Microsoft.Exchange.Diagnostics.Service.exe.config
Change the parameter “DriveLockCheckEnabled” value=”True” to “DriveLockCheckEnabled” value=”False” and save the config-file.
<!– Settings used when checking Bitlocker state of the drive where the diagnostics root directory exists –>
<add key=”DriveLockCheckEnabled” value=”False” />
<add key=”DriveLockCheckInterval” value=”00:00:10″/>
<add key=”DriveLockMaxDuration” value=”00:04:00″/>
Restart MicrosoftExchangeDiagnostics service, and the error message is gone.
I was doing a migration between Exchange 2013 and Office 365 in a Hybrid configuration when I recieved the above error message. Couldn’t quite figure out why until I stumbled accross a forum thread that pointed me in the right direction.
This is what you have to check out and remediate if you have this error:
The ExchangeGuids of on-premise users are different to the ExchangeGuids of the corresponding users in Office 365.
Update the online user’s ExchangeGuid to match the on-premise ExchangeGuid and start migration.