Microsoft has released the September update for Lync Server 2013 (5.0. 8308.815) last week. Just like the ones that came before this update, there are several bug fixes included in to this update. List of the bug fixes that had been addressed are stated below;

• Update for Central Management Server
  2910244 Description of the cumulative update 5.0.8308.577 for Lync Server 2013 Central Management Server: January 2014
• Update for Backup Service
  2910243 Description of the cumulative update 5.0.8308.577 for Lync Server 2013 Backup Service: January 2014
• Update for Standard or Enterprise Edition server (Front End Servers and Edge Servers)
  2987510 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013 (Front End Server and Edge Server)
• Update for Unified Communications Managed API 4.0, Core Runtime 64-bit
  2995717 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013, Unified Communications Managed API 4.0 Runtime
• Update for Web Components server
  2995718 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013, web components server
• Update for Core Components
  2987511 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013 core components
• Update for Call Park Service
  2881703 Description of the cumulative update 5.0.8308.556 for the Lync Server 2013, Call Park service: October 2013
• Update for Conferencing Announcement
  2881701 Description of the cumulative update 5.0.8308.556 for Lync Server 2013, Conferencing Announcement: October 2013
• Update for Conferencing Attendant
  2995716 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013, Conferencing Attendant
• Update for Mediation server
  2881699 Description of the cumulative update 5.0.8308.556 for Lync Server 2013, Mediation Server: October 2013
• Update for Administrative Tools
  2967485 August 2014 Cumulative Update 5.0.8308.738 for Lync Server 2013, Administrative Tools
• Update for Web Conferencing server
  2937314 August 2014 Cumulative Update 5.0.8308.738 for Lync Server 2013, Web Conferencing Server
• Update for Unified Communications Managed API 3.0 Workflow APIs
  2835438 Description of the cumulative update 5.0.8308.420 for Lync Server 2013, UCMA 3.0 Workflow APIs: July 2013
• Update for Conferencing server
  2835434 Description of the cumulative update 5.0.8308.420 for Lync Server 2013, Conferencing Server: July 2013
• Update for Persistent Chat server
  2835433 Description of the cumulative update 5.0.8308.420 for Lync Server 2013, Persistent Chat: July 2013
• Update for Windows Fabric
  2967486 August 2014 Cumulative Update 5.0.8308.738 for Lync Server 2013

Download the Update Installer from “http://www.microsoft.com/en-us/download/details.aspx?id=36820” URL and follow the instructions.

Keep in mind to update the Back End databases and run Windows Fabric update on the Front End servers as well as the Edge servers.