If your customer is using Office 365, you need to set up the exchange server configuration as in the image:
For copy paste: https://outlook.office365.com/EWS/Exchange.asmx
Print & Delivery Exchange settings with Office 365
If your customer is using Office 365, you need to set up the exchange server configuration as in the image:
For copy paste: https://outlook.office365.com/EWS/Exchange.asmx