public static void Run() { // ExStart:AddingHeadersToEWSRequests using (IEWSClient client = EWSClient.GetEWSClient("exchange.domain.com/ews/Exchange.asmx", "username", "password", "")) { client.AddHeader("X-AnchorMailbox", "*****@*****.**"); ExchangeMessageInfoCollection messageInfoCol = client.ListMessages(client.MailboxInfo.InboxUri); } // ExEnd:AddingHeadersToEWSRequests }