SfB 2015 Server Update – November 2020

It’s been four months since we saw an update for Skype for Business Server 2015, which was a rare security update that took us to 6.0.9319.591.

This is build 6.0.9319.598, and it updated only two components on my Standard Edition Front-End.

What’s Fixed?

This cumulative update includes a defense in depth fix and enables Location-Based Routing to support the Skype for Business mobile clients. It also fixes the following issues:

  • Kb 4583546 Support push notification for iOS 13 in Skype for Business Server 2015.

What’s New?

Nothing noted. No cmdlets have been added to the SfB module in this update.

What’s Changed?

Nothing noted.

Known Issues

After you install the January 2019 cumulative update 6.0.9319.537 (CU8) for Microsoft Skype for Business Server 2015, the Unified Communications Web API (UCWA) applications, such as Skype for Business on Mac, a web application for UCWA, and Skype for Business mobile clients, can’t make a call or join a meeting. For more information, please see the following article:

UCWA client cannot make a call or join a meeting after installing Skype for Business Server update 6.0.9319.537



Here’s the “before” view of it going on to my Lab’s Standard Edition Front-End:


The installer didn’t prompt me to reboot, but I always like to give it one for good measure.

Revision History

25th November 2020: This is the initial release.
– G.

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