Assume that you deploy a Microsoft Lync Server 2010 environment in a domain that contains more than one domain controller or global catalog. When you run the Enable-CSUser or the Disable-CsUser cmdlet with the DomainController parameter in the Lync Server Management Shell, the DomainController parameter is ignored. In this situation, the user might be enabled or disabled on a wrong domain controller or globe catalog.
To resolve this issue, install the following cumulative update:
2514981 Description of the cumulative update for Lync Server 2010, Core Components: November 2011
For more information about the Enable-CsUser command, visit the following Microsoft website: