 <p>Outlook Object Model cannot be used from a service. You can use </p> <ol> <li>Extended MAPI (C++ or Delphi only) </li> <li><a href="http://msdn.microsoft.com/en-us/library/office/dd877045(v=exchg.140).aspx" rel="nofollow">Exchange Web Services</a> if you are dealing with Exchange 2007 (or newer) mailboxes</li> <li><a href="http://www.dimastr.com/redemption/" rel="nofollow">Redemption</a> (its <a href="http://www.dimastr.com/redemption/rdo_introduction.htm" rel="nofollow">RDO family of objects</a> wraps Extended MAPI and can be used from any language).</li> </ol>