<object id="tts_flash" width="18" height="18" type="application/x-shockwave-flash" data="http://www.gstatic.com/translate/sound_player2.swf"> </object> I have a windows server 2008 R2 enterprise, it installed the Communicator 2007R2. If I send a message to one person, okay, I can usually send and receive responses, any User of the network. However if I try to add more than one person to send a message once to multiple users, via the button to invite, to send the reply I get the error messages the following section: Error trying to start the conference. More details (ID: 504) The following message was not delivered to all participants. More details (ID: 504) anyone have any tips of the problem? MCP

Hello, I think it will be better to ask here: http://social.technet.microsoft.com/Forums/en-US/category/ocs This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator