A time-out occurred while trying to retrieve mailbox data for user '%1' in the call with ID '%2'. If this event occurs frequently, ...

A time-out occurred while trying to retrieve mailbox data for user '%1' in the call with ID '%2'. If this event occurs frequently, it can indicate a poor connection or high latencies in calls to the Mailbox server. This may result in a poor caller experience. Additional information: 
Mailbox server '%3', 
DBName '%4', 
%5