I recently configured a new installation of ZCS 7 , the domain use AD authentication and I succesfully configured SSO for the web clients , though while trying to leverage it with outlook ( 2010 x86 ) I get this error :

	*0* <<<<================================= HTTP stream Start (Response) ===============================================>>>>
 						>Connection::ReadResponseFully[#1, 03ED7D48, owner:'UserSession']
							*0* ---------- HTTP Headers: ----------
							HTTP/1.1 401 Unauthorized
 							Cache-Control: must-revalidate,no-cache,no-store
 							Date: Thu, 14 Jun 2012 13:26:13 GMT
							Content-Length: 1385
 							Content-Type: text/html; charset=iso-8859-1
 							WWW-Authenticate: Negotiate
							*0* Content-length in http response header: 1385
							*0* ---------- HTTP body: ----------
 							<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
							<title>Error 401 UNAUTHORIZED</title>
							<body><h2>HTTP ERROR 401</h2>
 							<p>Problem accessing /service/spnego. Reason:
 							<pre>    UNAUTHORIZED</pre></p><hr /><i><small>Powered by Jetty://</small></i><br/>

Does anyone more expert on Zimbra can give me any insight ??

Thank you in advance