You want to generate a new meeting ID as the default (authenticated meetings) and you run the LYNC Server Management cmdlet Set-CsMeetingConfiguration –DesignateAsPresenter None.  However, it appears you still have to choose the “customize” checkbox before it will default to a private meeting.  Without choosing customize it will still create a public meeting (using the static meet ID).  If you click the customize box in the outlook add-in and click remember settings, add-in will create private meeting every time you schedule a meeting.  If you don’t customize the options in the add-in or remove the checkbox it will create a public meeting with static meeting ID.

Using the LYNC Server Management Shell there are two switches for the cmdlet Set-CsMeetingConfiguration that can affect this.

  • EnableAssignedConferenceType – Indicates whether users are allowed to schedule public meetings. With a public meeting, the conference ID and the meeting link remain consistent each time the meeting is held. With a private meeting, the conference ID and meeting link change from meeting to meeting. The default value is True.
  • AssignedConferenceTypeByDefault – Determines whether new meetings will be configured, by default, as public meetings. Set this value to True to use public meetings by default; set this value to False to use private meetings by default. The default value is True.

If you set EnableAssignedConferenceType to false, there is now, no checkbox to customize settings

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When EnableAssignedConferenceType is set to false, outlook will always create a new private meeting with different meeting id.

http://technet.microsoft.com/en-us/library/gg398648.aspx