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In a Microsoft Office Communications Server 2007 R2 conference, after you enter your telephone extension number, you may hear a message that states that your PIN is locked, expired, or not set. You hear this before you enter your PIN.
To resolve this issue, apply the following update:
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
969822 Description of the update package for Office Communications Server 2007 R2, Conferencing Attendant: July 2009
After you apply this update, you hear this message after you input your telephone extension number and your PIN.