Each service logs an event to the application event when startup has completed.
| Service | Event source | Event number |
| System attendant | MSExchangeSA | 1000 |
| Directory | MSExchangeDS | 1000 |
| MTA | MSExchangeMTA | 9298 |
| Information store | MSExchangeIS Public | 1001 |
| MSExchangeIS Private | 1001 | |
| Internet Mail Service | MSExchangeIMC | 1000 |
| Key Management server | MSExchangeKMS | 1001 |