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 '{4}' operation issued by this user took {0} seconds. This operation requires writing data to disk. If a large message or attachment is being saved, this delay may be normal. However, long delays may also indicate there is a disk bottleneck present.