http://blogs.technet.com/b/nexthop/archive/2008/03/05/how-to-install-a-trusted-root-ca-certificate-on-osx-leopard-for-use-with-messenger-for-macintosh.aspxAuthor: Michael Wagner Publication date: March 2008 Product version: Office Communications Server 2007 R2 Add private certificate to the x509 Anchors keychain Open keychain access application. Use finder and find the HDD/Applicationsen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/nexthop/archive/2008/03/05/how-to-install-a-trusted-root-ca-certificate-on-osx-leopard-for-use-with-messenger-for-macintosh.aspx#3458804Wed, 12 Oct 2011 12:21:34 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3458804Tom Laciano (Microsoft)<p>Rick,</p> <p>No the Mac workstation and client do not need to be joined to the domain for audio and video externally. The client sign-in process with account and password is what authenticates and then authorizes your use of the features. Do keep in mind the administrator assigns policies to a user which may restrict whether the full feature is available to you. </p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3458804" width="1" height="1">http://blogs.technet.com/b/nexthop/archive/2008/03/05/how-to-install-a-trusted-root-ca-certificate-on-osx-leopard-for-use-with-messenger-for-macintosh.aspx#3456190Thu, 29 Sep 2011 00:35:13 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3456190rick<p>do I need to join mac client to windows domain in order oc user can sharing audio and video externally?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3456190" width="1" height="1">