Lync 2013 / SfB 2015 Client Update – August 2017

It’s been 3 weeks since our last update to the Office 2013-based Lync/SfB client. Today we go from 15.0.4945.1000 to 15.0.4953.1000, aka Kb 4011046.

What’s Fixed

A handful of items are addressed in this update:

  • Kb 4035431 “Call forwarding settings failed” dialog occurs after you sign out Skype for Business 2015 (Lync 2013) if RCC is enabled
  • Kb 4035430 Switch between “Compact View” and “Content View” does not work in Skype for Business 2015 (Lync 2013)
  • Kb 4035429 Improves join launcher when you join a Skype meeting through a meeting link in Skype for Business 2015 (Lync 2013)
  • Kb 4035428 Updates factory image version number for Lync Room System devices in Skype for Business 2015 (Lync 2013)
  • Kb 4035427 Security issues when trying to connect to the “” domain in Skype for Business 2015 (Lync 2013)
  • Kb 4035426 Unread messages in persistent chat rooms are marked as read when you click IM conversation tabs in Skype for Business 2015 (Lync 2013)
  • Kb 4035425 “MAPI unavailable” error for MAPI connection in Skype for Business 2015 (Lync 2013)
  • Kb 4035424 Several seconds delay on an incoming instant message toast in Skype for Business 2015 (Lync 2013)
  • What’s New / Changed

    Nothing documented.

    Known Issues

    Nothing documented.


    It’s been a big year for pre-req updates, but if you’re current (to 15.0.4933.1000 or 15.0.4945.1000) then you’re OK today.

    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-kb4011046-fullfile-x86-glb.exe)
    • x64 (lync2013-kb4011046-fullfile-x64-glb.exe)


    I have all the pre-req’s already installed, so a reboot was not required.

    Before / After



    SfB 15.0.4933.1000 MSO 15.0.4945.1001 SfB 15.0.4953.1000 MSO 15.0.4945.1001
    Lync2013ClientUpdate20170809-Before Lync2013ClientUpdate20170809-After

    Revision History

    9th August 2017: This is the initial post.


    – G.

    Leave a Reply

    Your email address will not be published. Required fields are marked *

    ... and please just confirm for me that you're not a bot first: Time limit is exhausted. Please reload the CAPTCHA.

    This site uses Akismet to reduce spam. Learn how your comment data is processed.