Calendar Outlook日历中的约会

我正在使用VB.Net和EWS管理的API在Exchange 2010中创建约会。当我调用“Save”方法时，约会不会在第一台机器上创建，但当我在第二台机器上使用相同的代码时，它会工作

谢谢

我使用以下代码在Outlook日历中保存约会：

appointment.RequiredAttendees.Add(myKalender)
    appointment.IsReminderSet = False

    Try
        System.Net.ServicePointManager.ServerCertificateValidationCallback = _
          Function(se As Object, _
          cert As System.Security.Cryptography.X509Certificates.X509Certificate, _
          chain As System.Security.Cryptography.X509Certificates.X509Chain, _
          sslerror As System.Net.Security.SslPolicyErrors) True


        appointment.Save(SendInvitationsMode.SendToNone)

        Console.Write("erfolgreich Eingetragen " & Now)
    Catch
        Console.Write("Fehler beim Erstellen des Termins " & Now & " " & Err.Description)
    End Try