Consider the following scenario:
You join an online meeting that is created by Lync 2010 Attendee on a computer that is running Office Communicator 2007 R2.
You join the online meeting by using Lync Web App.
You use Office Communicator 2007 R2 to connect to the online meeting to use voice.
In this scenario, certain functions in the conversation window of Office Communicator 2007 R2 duplicate with the functions in Lync Web App. This behavior can be confusing.
Install the following cumulative update:
2291453 Description of the cumulative update package for Communicator 2007 R2: November 2010
This hotfix disables the following functions in the conversation window that is described in the “Symptoms” section:
Invite a contact
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.