Lync 2010 mobile client sign-in fails after you apply the Lync Server 2010 Mobility Service update for October 2012

Applies to: Lync Server 2010 Enterprise EditionLync Server 2010 Standard Edition

Symptoms

Consider the following scenario. You take one of the following actions:
  • You apply the Microsoft Lync Server 2010 Mobility Service update for October 2012 to a Microsoft Lync Server 2010 Director.
  • You apply the Lync Server 2010 Mobility Service update for October 2012 by using the Cumulative Server Update Installer (LyncServerUpdateInstaller.exe) from the GUI or from a command line. 
In this scenario, the Microsoft Lync 2010 mobile client sign-in process fails.

Cause

When you apply the Lync Server 2010 Mobility Service update for October 2012, the Cumulative Server Update Installer (LyncServerUpdateInstaller.exe) adds the Mcx virtual application to the local installation of Internet Information Services (IIS) on a Lync Server 2010 Director.

Note The Lync Server 2010 Director server role supports the Autodiscover virtual application together with the local installation of IIS.

Workaround

To work around this issue, follow these steps.

If the Lync Server 2010 Mobility service is installed, follow these steps to remove the service.

In Windows Server 2008 or Windows Server 2008 R2
  1. Click Start, and then click Control Panel.
  2. Click Programs, and then click Uninstall a Program.
  3. In the list of programs, locate and then right-click Microsoft Lync Server 2010 Mobility Service.
  4. Click Uninstall to remove the Lync Server 2010 Mobility Service.
  5. Make sure that the Mcx virtual folder is removed from the Lync Server 2010 internal and external websites that are hosted in the local installation of IIS on the Lync Server 2010 Director. To do this, follow these steps:
    1. Click Start, and then click Administrative Tools.
    2. Locate and then double-click Internet Information Server (IIS) Manager.
In Windows Server 2012
  1. Press the Windows function key to open the Start page.
  2. Click the Control Panel tile.
  3. Click Programs, and then click Uninstall a Program.
  4. In the list of programs, locate and then right-click Microsoft Lync Server 201.0 Mobility Service.
  5. Click Uninstall to remove the Lync Server 2010 Mobility Service.
  6. Make sure that the Mcx folder is removed from the Lync Server 2010 internal and external websites that are hosted in the local installation of IIS on the Lync Server 2010 Director. To do this, follow these steps:
    1. Press the Windows function key to open the Start page.
    2. Click the Administrative Tools tile.
    3. Locate and then double-click Internet Information Server (IIS) Manager.
    4. Locate the Lync Server 2010 Mobility Service Mcx folder. To do this, follow these steps:

      1. Use the IIS Manager tree view to expand the IIS Server node, and then expand the Sites folder.
      2. Expand the Lync Server external website.
      3. If the Mcx virtual folder is listed, right-click the folder, and select Remove.
      4. Expand the Lync Server internal website.
      5. If the Mcx virtual folder is listed, right-click the folder, and then select Remove.
After you follow these steps, you must restart the Windows-based server.

To install the Lync Server 2010 Mobility Service from the Lync Server 2010 Director, follow the steps in the following Microsoft TechNet article:
Install Mobility Service and Autodiscover Service

More Information

After you reinstall the Lync Server 2010 Mobility Service, the latest cumulative update that is currently installed for the Lync Server 2010 Mobility service should be retained.