Unlocking the Conversation or Conference
Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
Only a leader can unlock the conversation or conference.
If you are the leader, in the Conversation window, click the arrow next to Invite and then click the check mark next to Lock this conversation to unlock the conversation.