This cumulative update fixes a list of issues in Microsoft Lync Server 2013, Core Components. The version number of this update is 5.0.8308.974. Improvements and issues that the cumulative update contains. The cumulative update contains improvements that are described in the following Microsoft Knowledge Base article:

This update allows Windows desktop applications that depend on the Windows 10 Universal CRT release to run on earlier Windows operating systems. Microsoft Visual Studio 2015 creates a dependency on the Universal CRT when applications are built by using the Windows 10 Software Development Kit (SDK).

Upgrade or update Front End servers. Topologies and components for Front End servers, instant messaging, and presence. The Cumulative Server Update Installer applies all updates for the appropriate server role in one operation. To use the Cumulative Server Update Installer, follow these steps.

This cumulative update resolves the following issues: KB 3034776 Memory leak occurs in w3wp.exe, MediationServerSvc.exe, and sqlservr.exe in a Lync Server 2013 environment. KB 3034781 Central Management Store file replication is slow or incomplete in a Lync Server 2013 environment.

This cumulative update fixes the following issues: KB 3148961 Event ID 56417 when the window title of combined programs exceeds 128 characters in Lync Server 2013. KB 3148960 "New sharer joined the conference" message when you try to share your desktop in an online meeting in Lync Server 2013.

A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This key, which is a 48-digit number, is used to regain access to the drive. You might be prompted for the BitLocker recovery key during startup, due to a security risk or hardware change:

We recommend you install the latest update for your device as it contains important improvements and issue resolutions, including this one. After a fresh install or an In-place upgrade to Windows 11, version 24H2, you might face issues with connecting via DirectAccess.

This article describes the Microsoft Input Method Editor 2010 issue that is fixed in the hotfix package that is dated April 24, 2012.

To install the cumulative update for Skype for Business Server 2015 core components, follow the steps that are described in Updates for Skype for Business Server 2015 (KB 3061064). Note The Cumulative Server Update Installer applies all updates for the appropriate server role in one operation.

Microsoft has released a cumulative update for Skype for Business Server 2015, Core Components. The version number of this update is 6.0.9319.598. Issues that the cumulative update fixes. This cumulative update includes the following improvement: 4583546 Support push notification for iOS 13 in Skype for Business Server 2015.