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      object oNameSpace = oApp.GetType().InvokeMember("GetNamespace", BindingFlags.InvokeMethod, null, oApp, new object[1] { "MAPI" });

      for (int i = 0; i < 30; i++) //Druchsucht die Ordnerstruktur in Outlook
      {

        try
        {
          object objDefaultFolder = oNameSpace.GetType().InvokeMember("GetDefaultFolder", BindingFlags.InvokeMethod, null, oNameSpace, new object[] { i });
          object objFolderItems = objDefaultFolder.GetType().InvokeMember("Folders", BindingFlags.InvokeMethod, null, objDefaultFolder, null);

          int numofentries = (int)objFolderItems.GetType().InvokeMember("Count", BindingFlags.InvokeMethod, null, objFolderItems, null);

          try
          {
            string parentFoldername = (String)objDefaultFolder.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, objDefaultFolder, null);
            if (parentFoldername.Contains("Alle Öffentlichen"))
            {
              System.Collections.IEnumerable items = (System.Collections.IEnumerable)objFolderItems;
              foreach (object cItem in items)
              {
                string foldername = (String)cItem.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, cItem, null);
                if (foldername.Contains("Termine Schule"))
                {
                  string folderpath = (String)cItem.GetType().InvokeMember("FolderPath", BindingFlags.GetProperty, null, cItem, null);  //Outlookpfad des Ordners
                  try
                  {
                    itemsToFile(cItem) //Einzelne Element in Datei speichern
                    break;
                  }
                  catch (Exception ex)
                  {
                    errorcode = 0;
                    
                  }
                }                
              }
            }

          }
          catch
          {
          }

        }
        catch (Exception ex)
        {

        }
      }
    
    //summery ist nur eine ausgabe am Bildschirm zum Debuggen!
    public int itemsToFile(Object curObj)
    {
        FileHandling file = new FileHandling();
        file.WriteFile(dateiPfad, "BillingInformation;Body;CreationTime;Duration;Location;Subject;Start;End\n");
        StringBuilder outString = new StringBuilder();


        object objCalendarItems = curObj.GetType().InvokeMember("Items", BindingFlags.InvokeMethod, null, curObj, null);

        int numofItems = (int)objCalendarItems.GetType().InvokeMember("Count", BindingFlags.InvokeMethod, null, objCalendarItems, null);
        System.Collections.IEnumerable items = (System.Collections.IEnumerable)objCalendarItems;
        foreach (object cItem in items)
        {
            outString.Append((string)cItem.GetType().InvokeMember("BillingInformation", BindingFlags.GetProperty, null, cItem, null) + ";");
            outString.Append((string)cItem.GetType().InvokeMember("Body", BindingFlags.GetProperty, null, cItem, null) + ";");
            outString.Append(((DateTime)cItem.GetType().InvokeMember("CreationTime", BindingFlags.GetProperty, null, cItem, null)).ToString() + ";");
            outString.Append(((int)cItem.GetType().InvokeMember("Duration", BindingFlags.GetProperty, null, cItem, null)).ToString() + ";");
            outString.Append((string)cItem.GetType().InvokeMember("Location", BindingFlags.GetProperty, null, cItem, null) + ";");
            outString.Append((string)cItem.GetType().InvokeMember("Subject", BindingFlags.GetProperty, null, cItem, null) + ";");
            outString.Append(((DateTime)cItem.GetType().InvokeMember("Start", BindingFlags.GetProperty, null, cItem, null)).ToShortDateString() + " " +
              ((DateTime)cItem.GetType().InvokeMember("Start", BindingFlags.GetProperty, null, cItem, null)).ToShortTimeString() + ";");
            outString.Append(((DateTime)cItem.GetType().InvokeMember("End", BindingFlags.GetProperty, null, cItem, null)).ToShortDateString() + " " +
              ((DateTime)cItem.GetType().InvokeMember("Start", BindingFlags.GetProperty, null, cItem, null)).ToShortTimeString() + "\n");
            
            object attatchments=cItem.GetType().InvokeMember("Attachments", BindingFlags.GetProperty, null, cItem, null);


            int attatchmentcount = (int)attatchments.GetType().InvokeMember("Count", BindingFlags.GetProperty, null, attatchments, null);
            if (attatchmentcount > 0)
            {
              summery.Append((string)cItem.GetType().InvokeMember("Subject", BindingFlags.GetProperty, null, cItem, null) + "\n");
                //object item==cItem.GetType().InvokeMember("Attachments", BindingFlags.GetProperty, null, cItem, null);
              //attatchments.GetType().InvokeMember("WriteToFile", BindingFlags.InvokeMethod, null, attatchments, new object[1] { "test.txt" });
              //summery.Append((string)attatchments.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, attatchments, null));

              object item = attatchments.GetType().InvokeMember("Item", BindingFlags.InvokeMethod, null, attatchments, new object[1] {0});
              
        item.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, item, null);                    

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        //summery.Append((string)item.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, item, null));

             

            }
        }

        file.Append(dateiPfad, outString.ToString());
        return numofItems;
    }                    

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using Outlook = Microsoft.Office.Interop.Outlook;                    

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Outlook.Application olApp = new Outlook.ApplicationClass();
Outlook.NameSpace olNS = olApp.GetNamespace("MAPI");
Outlook.MAPIFolder oFolder = olNS.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderCalendar);
Outlook.Items oCalendarItems = oFolder.Items;
foreach (Outlook.AppointmentItem oCalendarItem in oCalendarItems)
{
  Outlook.Attachments oAttachments = oCalendarItem.Attachments;
  foreach (Outlook.Attachment oAttachment in oAttachments)
  {
    oAttachment.SaveAsFile(Path.Combine("c:\\temp\\test", oAttachment.FileName));
  }
}                    

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Outlook.MAPIFolder oPublicFolders = olNS.GetDefaultFolder(Outlook.OlDefaultFolders.olPublicFoldersAllPublicFolders);
Outlook.Folders oFolders = oPublicFolders.Folders;