.NET (Core and Framework)

using Outlook = Microsoft.Office.Interop.Outlook;

outlook = new Outlook.Application();
Outlook._NameSpace olNS = outlook.GetNamespace("MAPI");
Outlook.MAPIFolder oPublicFolder = olNS.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olPublicFoldersAllPublicFolders);

Outlook.MAPIFolder tiFolder = null;
foreach (Outlook.MAPIFolder currentFolder in oPublicFolder.Folders)
{
   if ("DesiredFolder" == currentFolder.Name)
   {
      tiFolder = currentFolder;
      break;
   }
}
if (null != tiFolder)
{
   Outlook._Items oItems = tiFolder.Items;
   for (int i = 1; i <= oItems.Count; i++)
   {
      try
      {
         Outlook._ContactItem oContact = (Outlook._ContactItem)oItems[i];
      }
      catch (Exception ex)
      {
         try
	 {
	    Outlook._DistListItem distributionList = (Outlook._DistListItem)oItems[i];
            // distributionList is thing I want; need to get members
            // :confused: :confused: :confused:
         }
         catch (Exception ex1)
	 {
         }
      }
}