To connect your Exchange calendar, you need to provide your OWA address.
The OWA (Outlook Web Access) address is a URL to your company's Exchange server.
If your company supports OWA, this is a URL you would enter in the browser to launch Outlook Web Access. Your IT department may be able to advise if OWA is supported and what is the exact URL.
You can also locate the OWA address in your Outlook client.
To do so:
Open Microsoft Outlook.
Locate Account Settings.
If your company supports OWA, the URL should be displayed below the text
"Access this account on the web".
Copy the URL and paste it into the OWA Address field when connecting your Exchange calendar.