The MAPI property PR_IPM_WASTEBASKET_ENTRYID (0x35E30102) gives you the
EntryID of the Deleted Items folder but it can't be accessed using the
Outlook object model. It's a property of the InfoStore object (IMsgStore) so
you'd need CDO 1.21 or Extended MAPI or Redemption code to get at it. Even
using Redemption you'd need to use CDO or Extended MAPI to get at the
InfoStore object.