This is an informational event and it specifies that the Microsoft Exchange Transport service successfully started. It is logged every time the Microsoft Exchange Transport service starts.
Event Viewer Details
| Product | Microsoft Exchange | Version | 15.0 |
| Event ID | 1001 |
| Source | MSExchangeTransportService |
| Message | The service has started successfully. PID XXXX. |
Causes
This event is logged every time your Exchange server restarts or the Microsoft Exchange Transport service restarts.
Resolutions
This is an informational event that can safely be ignored.