Doc: add a new FAQ entry on shared mailbox access over IMAP

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@1966 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/site/xdoc/faq.xml

@@ -295,6 +295,14 @@ calendar.debug.log.verbose=true]]></source>
                     <code>true</code>
                     to send messages as quoted-printable.
                 </p>
+                <p>
+                    <strong>Access another user mailbox</strong>
+                </p>
+                <p>Either set base IMAP path in client settings or use the following username:
+                    <code>domain\user\otheruser@company.com</code> where otheruser@company.com it target mailbox
+                    name.
+                </p>
+
             </subsection>
 
             <subsection name="Build">