To install updates for a Lync Server 2013 installation that has any of the following cumulative updates installed, perform Step 1 and Step 2. To install updates for Lync Server 2013 RTM (5.0.8308.0), follow steps 1–5. Important Do not shut down or restart all Front End servers at the same time.

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:

Run the Cumulative Server Update Installer by using the UI or a command to upgrade the front-end servers associated with an upgrade domain. NOTE: If you upgrade or update front-end servers during scheduled server downtime, you can run the cmdlet in step 2 without the -Graceful parameter.

Lync Server 2013 Standard Edition and other Roles. Run the Cumulative Server Update Installer by using the UI, or by running a command line to upgrade the front-end servers that are associated with an upgrade domain.

Run the Cumulative Server Update Installer by using the user interface (UI) or by using a command line. Note When you click Install Updates, the UI indicates which updates are installed.

Step 1: Install the cumulative updates. Important To maintain a functional Lync Server 2013 Enterprise Edition pool, you must make sure that the State value of the pool is Ready when you run the Get-CsPoolUpgradeReadinessState cmdlet, and that you have the appropriate number of Lync Server 2013 Front End servers running. See the "Upgrade or Update Front End Servers" and "Planning for the ...

Step 1: Install the cumulative updates. Important To maintain a functional Lync Server 2013 Enterprise Edition pool, you must make sure that the State value of the pool is Ready when you run the Get-CsPoolUpgradeReadinessState cmdlet, and that you have the appropriate number of Lync Server 2013 Front End servers running. See the "Upgrade or Update Front End Servers" and "Planning for the ...

Run the Cumulative Server Update Installer by using the UI or a command to upgrade the front-end servers associated with an upgrade domain. NOTE: If you upgrade or update front-end servers during scheduled server downtime, you can run the cmdlet in step 2 without the -Graceful parameter.

Run the Cumulative Server Update Installer by using the UI or by using a command to upgrade the front end server(s) associated with an upgrade domain.

The Get-CsPoolUpgradeReadinessState cmdlet also returns information about the upgrade domains in the pool, and about which front-end servers are in each upgrade domain.