Lync Server RTM is right around the corner and one of the nicest feature of the product is the Lync Web App Meeting. In this post the Lync Server Team explains what is necessary to be configured on your system to start collaborating using this new feature.
To successfully attend this meeting and have an optimal experience, ensure the following on the system from which you plan to join the meeting using Lync Web App:
1. You need to be on a supported browser and platform combination
2. You need to have Microsoft Silverlight 4.0 (or later) installed
3. Disable pop-up blockers in your browser
Read more at source: http://communicatorteam.com/archive/2010/11/12/2000.aspx