protected void MyButton_Click(CommandBarButton cmdBarbutton,ref bool cancel) 
{
 System.Windows.Forms.MessageBox.Show("MyButton was Clicked","MyAddin1"); 

 Outlook.Application objApp;
 Outlook.NameSpace objNameSpace;
 Outlook.MAPIFolder objMapiFolder;
 Outlook.MailItem objMailitems;			
 try 
 {
	objApp = new Outlook.Application();
	objNameSpace = objApp.GetNamespace("MAPI"); // Wie im VBA Beispiel 

	objMapiFolder = objNameSpace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);
	//Holt sich den Standard E-Mail Folder Inbox
	objMailitems = (Outlook.MailItemClass)objMapiFolder.Items; //ob das klappt wie gewollt?
	
	// ab hier läuft es noch nicht...
	//foreach (Outlook._MailItem  mitem in objMailitems )
	//{}
	//objMailitem =  Outlook.MailItem();
	//objMailitem = new Outlook.MailItem();				
 }
 catch( Exception theException ) 
 {
	String errorMessage;
	errorMessage = "Error: ";
	errorMessage = String.Concat( errorMessage, theException.Message );
	errorMessage = String.Concat( errorMessage, " Line: " );
	errorMessage = String.Concat( errorMessage, theException.Source );
	//MessageBox.Show( errorMessage, "Error" );
 }
}