August 6, 2019, update for Skype for Business 2015 (Lync 2013) (KB4475564)

Applies to: Skype for Business 2015Lync 2013

Microsoft has released an update for Microsoft Skype for Business 2015 (Lync 2013) on August 6, 2019. This update also includes the new Skype for Business client. The version number of this update is 15.0.5163.1000.

In addition to the release of the new client, this update fixes a list of issues. Before you install this update, see the prerequisites.

Get update 4475564 for Skype for Business 2015 (Lync 2013)

Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Microsoft Download Center

The update is available for download from the Microsoft Download Center.




  • The download page will display this update as applicable to Lync 2013.
  • After you apply this update, Lync 2013 will be upgraded to Skype for Business.

    Get the general information about the new experience in Skype for Business.
  • You can still use the Lync client user interface (UI) after you apply this update for Skype for Business 2015 (Lync 2013).

    Get the general information about how to switch between the Skype for Business and the Lync client UI for Microsoft Office 365 users and Lync Server 2013 users.
  • For more information about how to download Microsoft support files, see the following article in the Microsoft Knowledge Base:
    119591 How to obtain Microsoft support files from online services


  • Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

More information


Before you install this update, you must install Microsoft Office 2013 Service Pack 1 (KB2817430).

Additionally, to install this update, you must have the following updates installed.

Restart information

You may have to restart the computer after you apply this update.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.



The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office. See Office System TechCenter.