Consider the following scenario
            - You assign a Session Initiation Protocol (SIP) Uniform Resource Identifier (URI) address to a user in a Microsoft Lync Server 2013 environment.
 - The address contains a reserved character, such as an ampersand. For example, the address is test.us&er@company.com.
 - The user signs in to a client for Lync by using the URI address in the environment.
 - You try to restart the Lync Server 2013 front-end service.