Hi, According to your online sample code, I need to provide the exchange mailbox URI for the relevant account in the following way:
ExchangeClient client = new ExchangeClient("http://servername/exchange/username",
…...GetEWSClient(“https:[//outlook.office365.com/ews/exchange...com/ews/exchange.asmx](https://outlook.office365.com/ews/exchange.asmx)”, “testUser”...