Emergency Services (E9-1-1) is not supported in Lync Windows Store App

Like the Lync mobile apps, the Lync Windows Store App should not be used for contacting an emergency services provider. For emergency calling to work, the client must be able to detect the user’s locale and then map to the physical address that the enterprise administrator has set up in advance. This capability is not available in Lync Windows Store App or Lync mobile apps. 

For information about client support for emergency services, see “Client Comparison Tables and Mobile Client Comparison Tables.”