<div class="content"><p>The Id method is received by the server in an RPC_REQUEST
packet. In response, the server MUST return the represented Message.Identifier.</p><dl>
<dd>
<div><pre> [propget] HRESULT Id(
   [out, retval] VARIANT* pvarMsgId
 );
</pre></div>
</dd></dl><p><b>pvarMsgId: </b>A pointer to a <a href="../ms-oaut/a6a540af-38ac-48be-bd40-92e2c01e9aa6" data-linktype="relative-path">VARIANT</a>
that contains a 20-byte array (VT_ARRAY | VT_UI1) that contains the unique <a href="3b7be3f7-651c-4f9c-930b-a9a7c4355ad8#gt_85c78cf0-1fb6-4e5d-85f5-a2e9f58a6b9e" data-linktype="relative-path">message</a> identifier.</p><p><b>Return Values: </b>The method MUST return S_OK
(0x00000000) on success or an implementation-specific error <a href="../ms-dtyp/a9046ed2-bfb2-4d56-a719-2824afce59ac" data-linktype="relative-path">HRESULT</a>
on failure.</p><p>When processing this call, the <a href="3b7be3f7-651c-4f9c-930b-a9a7c4355ad8#gt_434b0234-e970-4e8c-bdfa-e16a30d96703" data-linktype="relative-path">server</a> MUST follow these
guidelines:</p><ul><li><p><span><span> 
</span></span>Set the <i>pvarMsgId</i> output parameter to the value of the
represented Message.Identifier.</p>
</li></ul></div>