Lync 2013 / SfB 2015 Client Update – April 2018

What’s with the monthly client update cadence at the moment? No complaints here though: I personally benefit from possibly two of these fixes! The March update took us to 15.0.5015.1000, and our early April update (Kb 4018334) adds 8 builds to hit 15.0.5023.1000.

What’s Fixed

This update fixes the following issues:

  • Kb 4095404 A call to yourself is initiated when you add audio to an existing meeting in Skype for Business
  • Kb 4095405 High memory usage and crash when you receive an HTML message in Skype for Business
  • Kb 4095406 External user can’t sign in Skype for Business that uses TLS-DSK or modern authentication
  • Kb 4095407 Splitter bar in a tabbed conversation window doesn’t show when DPI setting is larger than 100% in Skype for Business
  • Kb 4095408 Repeated “You were added as delegate for” message at every logon in Skype for Business 2015 (Lync 2013)
  • Kb 4095409 Searching chat room history by date returns incorrect results when the date format is other than US format (mm/dd/yy)

What’s New / Changed

Nothing documented.

Known Issues

Nothing documented.


Move on – nothing to see here.

If however your patching isn’t to current you’ll need to check you have *all* of these pre-req’s. The Office 2013 SP1 requirement still applies if you’re using Outlook 2010. (Lync 2013 in all of its flavours – e.g. Lync Basic – is still a component of Office 2013).



Current Version


Update for Office 2013 (KB3054853) (NOTE 1 BELOW) 1.0 9 June 2015
LyncHelpLoc (kb3191937) 1.0 22 May 2017
Microsoft Office 2013 Language Pack Service Pack 1 (KB2817427) 1.0 13 February 2014

NOTE1: “You do not have to apply update KB3054853 if you applied the April 14, 2015, update (KB2889923) or the May 12, 2015, security update (KB3039779) for Lync 2013 (Skype for Business)”


This is the client fix itself:

  • x86 (lync2013-kb4018334-fullfile-x86-glb.exe)
  • x64 (lync2013-kb4018334-fullfile-x64-glb.exe)


I have all the pre-req’s already installed, had exited the client before we started & was not prompted for a reboot.

Before / After



SfB 15.0.5015.1000 MSO 15.0.5015.1000 SfB 15.0.5023.1000 MSO 15.0.5015.1000
BeforeKb4018334-April2018 AfterKb4018334-April2018

Revision History

4th April 2018: This is the initial post.


– G.

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