Microsoft releases April 2015 update for Lync/Skype for Business client

Following their announcement on the Skype for Business blog Microsoft released the updates to allow the UI change from Lync 2013 to Skype for Business:


  • Skype for Business 2015 desktop client (lyncmso) – KB2889923
  • Skype for Business 2015 desktop client (lynclochelp) – KB2889853

Both updates are cumulative and contain all previously released fixes for Lync 2013. 



  • After you apply this April 14, 2015 update, Lync 2013 will be upgraded to Skype for Business. Get the general information about the new experience in Skype for Business
  • You can still use the Lync client user interface after you apply this update for Skype for Business. Get the general information about how to switch between the Skype for Business and the Lync client user interfaces for Office 365 users and Lync Server 2013 users
  • Both patches required a minimum build of 15.0.4569.1506 (SP1) for Office 2013

More Resources:


  1. tomarbuthnot

    Thanks for the link back Guy. Hope all is good

    1. Guy Bachar (Post author)

      all is great! are you attending the Ignite?

  2. Ian

    Some users had lync 2013 addin in their Outlook 2010. After patch tuesday(Skype for Business update) Outlook crashes during startup. KB2889923 is installed. What can I do to prevent this ? thank for your help

    1. Guy Bachar (Post author)

      Hey Ian,

      I would check fist that Outlook 2010 is up to date:
      Also, i suggest trying to run OffCat 2.0, it will definitely tell you why Outlook has crashed and what cause it.

    2. Guy Bachar (Post author)

      Also, it seems it’s a known issue and hopefully it will be fixed soon:

  3. Pingback: Weekly IT Newsletter – April 13-17, 2015 | Just a Lync Guy

  4. Pingback: NeWay Technologies – Weekly Newsletter #143 – April 16, 2015 | NeWay

  5. Ian

    Hello Guy,

    Removing the KB didn’t solved the issue. Uninstalling Lync neither.I had to removed Outlook social connector add in.


Comments are closed.