//https://support.office.com/en-us/article/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040
//https://go.microsoft.com/fwlink/p/?linkid=858201
procedure TForm1.btnIMAPClick(Sender: TObject);
begin
  clImap.Server := 'imap-mail.outlook.com';
  clImap.Port := 993;
  clImap.UseTLS := ctImplicit;

  clImap.UserName := '_user_@hotmail.com';
  clImap.Password := 'secret';

  clImap.Open();
  clImap.GetMailBoxes(Memo1.Lines);
  clImap.Close();
end;

//by default, disabled
procedure TForm1.btnPOPClick(Sender: TObject);
var
  cnt: Integer;
begin
  clPop.Server := 'pop-mail.outlook.com';
  clPop.Port := 995;
  clPop.UseTLS := ctImplicit;

  clPop.UserName := '_user_@hotmail.com';
  clPop.Password := 'secret';

  clPop.Open();
  cnt := clPop.MessageCount;
  clPop.Close();

  ShowMessage(IntToStr(cnt));
end;

procedure TForm1.btnSMTPClick(Sender: TObject);
begin
  clSmtp.Server := 'smtp-mail.outlook.com';
  clSmtp.Port := 587;
  clSmtp.UseTLS := ctExplicit;

  clSmtp.UserName := '_user_@hotmail.com';
  clSmtp.Password := 'secret';

  clSmtp.Open();
  clSmtp.Noop();
  Memo1.Lines := clSmtp.Extensions;
  clSmtp.Close();
end;