The Exchange Server User Monitor (ExMon) RPC data indicates that the user '{3}' had a long-running MAPI operation of type ...

The Exchange Server User Monitor (ExMon) RPC data indicates that the user '{3}' had a long-running MAPI operation of type '{4}'. The longest-running 'FindRow' operation issued by this user took {0} seconds. This may indicate that the user has a large number of items in the folder that the FindRow is operated on. Consider reducing the number of items per folder.