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A user cannot join a Microsoft Lync 2010 conference until the meeting join page is refreshed.

Note This issue occurs if the update that is mentioned in Microsoft Knowledge Base (KB) article 2500441 is applied to Lync Server 2010.


This issue occurs because the browser does not download the latest Join launcher JavaScript file and use a cached JavaScript file. This JavaScript file is updated in the update that is mentioned in KB article 2500441.


A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

For more information about Microsoft KB article 2500441, click the following article number to view the article in the Microsoft Knowledge Base:

2500441 Description of the update package for Lync Server 2010, Web Components Server: April 2011

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