In earlier versions of Office Communications Server, scheduled meetings allowed anonymous users to attend meetings by default. In Lync Server 2010, meeting access for scheduled meetings is set to “My company” by default. Anonymous users and participants who use dial-in conferencing but for whom authentication fails are transferred to the lobby. Presenters can admit these users to the meeting.

However, for unscheduled Lync Server meetings, including Meet Now meetings, participant access is set to Everyone, including people outside my company by default, so anonymous users can join without waiting in the lobby.

You can use the following clients to join meetings scheduled through the Online Meeting Add-in for Microsoft Lync 2010:

• Lync 2010
  
  
• Microsoft Lync 2010 Attendant
  
  
• Microsoft Lync Web App
  
  
• Microsoft Lync 2010 Attendee
  
  
• Microsoft Office Communicator 2007 and Microsoft Office Communicator 2007 R2 (that is, only if the administrator has enabled them. For details, see the “Configuring the Meeting Join Page” section later in this topic.)
  
  

You cannot use the following clients to join meetings scheduled through the Online Meeting Add-in for Lync 2010:

• Communicator Web Access
  
  
• Microsoft Office Live Meeting 2007
  
  

The Lync Web App or Lync 2010 Attendee are the recommended alternatives for users who do not have Lync 2010 or Lync 2010 Attendant installed.

After a user is migrated to the Lync Server 2010 server, but before new clients are installed, the following Office Communications Server 2007 R2 client functionality continues to work on the new server:

• All scheduling functionality in the Conferencing Add-in for Microsoft Office Outlook
  
  
• All meeting links in previously sent meeting invitations
  
  
• Meet Now conferences in Office Communicator 2007 R2
  
  
• Escalation to Live Meeting (Share Information Using Live Meeting) from Office Communicator 2007 R2
  
  
• Dial-in conferencing numbers
  
  

  Note:
  Existing dial-in conferencing numbers work whether the meeting is hosted on Office Communicator 2007 R2 server or a Lync Server 2010 server. However, the latest Office Communicator 2007 R2 cumulative update is required on the Office Communicator 2007 R2 server pools.

When a migrated user installs Lync 2010, the Online Meeting Add-in for Lync 2010 is installed too. This has the following effects:

• All subsequently scheduled meetings use the new meeting format, which uses an https:// address instead of the legacy meet:// Live Meeting address.
  
  
• For an existing meeting that is migrated to Lync Server 2010, the organizer can modify most meeting details as usual. However, if the organizer wants to change the meeting end date, end time, participant list, or the meeting subject, the organizer must reschedule the meeting in the new Lync 2010 meeting format. When the organizer changes any of these details, the add-in will prompt the organizer to manually reschedule the meeting and send an updated meeting invitation to all participants.
  
  
• In an IT-managed deployment of Lync 2010, the administrator has the option of uninstalling the Conferencing Add-in for Microsoft Office Outlook, which is used to schedule Live Meeting server and service-based meetings. However, you may have users who need to continue to schedule Live Meeting service meetings. In this case, you can allow both add-ins to coexist.
  
  

The following meeting functionality continues to work for users who have installed Lync 2010:

• All meeting links in previously sent meeting invitations, including Communicator conference calls (conf:// URL prefix) and Live Meeting conferences (meet:// URL prefix).
  
  
• Audio conferencing information in previously sent meeting invitations, including meeting IDs.
  
  
• Sharing functionality in Office Communicator 2007 R2 meetings.
  
  
• Sharing functionality in peer-to-peer conversations or conferences that include Office Communicator 2007 R2 users.
  
  

  Note:

  In previous versions of Office Communications Server, all users could initiate desktop sharing in meetings. In Lync Server 2010 only meeting presenters can initiate desktop sharing. In recurring meetings that are migrated to Lync Server 2010, attendees can no longer initiate desktop sharing. If they need to do so, they must have a meeting presenter promote them to presenter so that they can initiate desktop sharing.

Users in federated organizations who are using Microsoft Office Communicator 2007 or Microsoft Office Communicator 2005 clients cannot join Lync Server 2010 meetings in your organization if those meetings are locked by the organizer. You need to reschedule these meetings in Lync Server 2010 so that when federated participants join the meeting by using the new https:// meeting URL, they have the option of using either Lync 2010 Attendee or Lync Web App.