Microsoft migrated from the legacy infrastructure to latest Office 365 based infrastructure
Following code snippet in c# will send HelloWorld message via EWS from outlook.com
var service = new ExchangeService
{
TraceEnabled = true,
TraceFlags = TraceFlags.All,
Credentials = new WebCredentials("user@outlook.com", "p@ssw0rd"),
Url = new Uri("https://outlook.com/EWS/Exchange.asmx")
};
var email = new EmailMessage(service);
email.ToRecipients.Add("recipient@outlook.com");
email.Subject = "HelloWorld";
email.Body = new MessageBody("This is the first email I've sent by using the EWS Managed API.");
email.Send();
For more code samples visit EWS Managed API docs