Symptoms

Assume that you receive a meeting invitation that was created in a Microsoft Lync Server 2013 environment. When you click the meeting hyperlink in Internet Explorer on a Windows Phone 8 device, the mobile client for Lync Server 2013 does not start. Then, you are prompted to sign in to Lync Web App (LWA). 

Cause

This issue occurs because the Join Launcher application incorrectly reads the user agent string of the Windows Phone 8 device.

Resolution

To resolve this issue, install the following cumulative update:

2781564 Description of the cumulative update for Lync Server 2013, Web Components: February 2013

Workaround

To work around this issue, join the meeting by using the Meeting pane in a Lync 2013 for Windows Phone client.

More Information

For more information about the new conferencing features, go to the following Microsoft website:

General information about the new conferencing features

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