A customized Lync 2010 Help URL does not work in Lync 2010

Symptoms

Consider the following scenario:

You set the CustomizedHelpUrl and EnableEnterpriseCustomizedHelp parameters to configure a client policy to customize the Lync 2010 Help Menu in a Microsoft Lync Server 2010 environment.
You apply the client policy to the users in the environment.
The update that is mentioned in Microsoft Knowledge Base (KB) article 2514982 is applied to a computer that Lync 2010 runs on.
A user signs in to Lync 2010.
The user clicks Lync Help F1 under Help.

In this scenario, Lync 2010 opens the following webpage instead of the customized webpage:

To resolve this issue, install the following cumulative update:

2670326 Description of the cumulative update for Lync 2010: February 2012

For more information about how to set a client policy, visit the following Microsoft website:

General information about how to a set client policyFor more information about how to customize the Lync 2010 Help menu, visit the following Microsoft website:

How to customize the Lync 2010 Help menu For more information, click the following article number to view the article in the Microsoft Knowledge Base:

2514982 Description of the cumulative update for Lync 2010: November 2011