• Single meeting client
  
  Microsoft Communicator "14" is the only client needed for all types of Communications Server 2010 meetings, including both scheduled meetings and ad-hoc meetings. This client replaces the need for the Live Meeting client and the Outlook Add-In.
  
  
• New downloadable meeting client
  
  Microsoft Communicator 2010 Attendee is a new downloadable client that enables users without Microsoft Communicator "14" installed to attend meetings that they are invited to. The first time a client without Communicator "14" attempts to join a meeting, they are prompted to download Microsoft Communicator 2010 Attendee. Once they have done so, the client remains on their computer.
  
  This downloadable client, designed for external users who are invited to your organization’s meetings, enables them to join a meeting, but does not include any functionality for IM, presence, or meeting scheduling.
  
  
• New meeting admission policy and controls
  
  Users who organize meetings can change authorization types after sending the invitation, if they discover the original settings were incorrect. They can even change these authorization types during the meeting.
  
  
• Meeting types
  
  Meeting types enable users to quickly specify who can get into meetings that they organize, based on permission templates they create.
  
  
• Simple URL
  
  Meeting URLs are simpler, easier to remember, and easier to communicate. All conference join links start with https://, which makes them shorter and less likely to be truncated by email clients, and also makes it possible for these links to launch web clients, if needed. The first part of a simple URL is your external FQDN, which can be followed by an easy-to-remember word like “meet.” For example, at the fictitious company Contoso, the administrators could specify https://Meet.contoso.com as their base for simple meeting URLs; the URL for a particular meeting may be https://Meet.contoso.com/677801.
  
  
• Assigned Conference replaces My Meeting
  
  This helps simplify meeting URLs.
  
  
• New Data Conferencing Server design
  
  The design of the Data Conferencing Server (which runs as part of the Front End Server) is improved to enable a better meeting and collaboration experience.
  
  

• Lobby provides improved user join experience
  
  Dial-in users who fail to authenticate when requested no longer need to disconnect and retry. These users are transferred to the lobby, the leader is notified, and the users wait until a leader accepts or rejects them, or they time out and are disconnected. While in the lobby, the users hear music.
  
  
• Access to DTMF commands during call
  
  Once admitted to a conference, dial-in users can exercise dual-tone multifrequency (DTMF) commands by using the phone keypad. Dial-in leaders can exercise DTMF commands to admit people from the lobby, toggle audience mute, lock or unlock the conference, and turn entry and exit announcements on or off. All dial-in participants can exercise DTMF commands to hear Help, play a private roll call, and mute self.
  
  
• Recorded name for anonymous callers
  
  Users who are not authenticated are prompted to record their name. The recorded name identifies unauthenticated users in the conference.
  
  
• Simplified leader join
  
  A leader can join the conference easier using their phone; they do not have to enter their phone number.
  
  

In previous versions of Communications Server, users could choose to share their entire desktop with other users during a conference. In Microsoft Communications Server 2010, users may also choose to share only selected applications with the other users.