# How does Cronofy connect to Exchange servers?

Cronofy uses the Exchange Web Services API to interact with end-user's Exchange servers.

This means that our services need `HTTPS (TCP, port 443)` access to the Exchange Services API endpoint. It generally looks something like this example:

```
https://webmail.mycompany.com/EWS/Exchange.asmx
```

If your organization has implemented [AutoDiscovery](https://technet.microsoft.com/en-us/library/bb124251(v=exchg.150)) our service will be able to automatically detect this.


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