Hi,
Our organization has hybrid environment. Few days ago one of our users sent 32 anonymous e-mail messages, but only 22 were successfully delivered. After little inspection, in Office 365 Message Trace I see that the status of 10 e-mail messages immediately after delivery has changed to LED=432 4.2.0 STOREDRV.Deliver.Exception:StorageTransientException.MapiExceptionLockViolation; Failed to process message due to a transient exception with message Query/Update out of office history operation. with Event ID set to Defer. What does that means? I can't find any documentation for this error code.
Do I need contact Office 365 Support or I can do something myself? Thanks!