Skype for Business Default Client Experience Matrix

The following table found on TechNet (https://technet.microsoft.com/en-us/library/dn954919.aspx) lists the default client behavior for Lync 2013 clients after deploying to the April 2015 client update.  Also, for those unable to push updates via inband provisioning or those who simply want to experiment with the UI on their local machine, here's a quick powershell script for changing the client UI: https://gallery.technet.microsoft.com/Quick-Skype-for-BusinessLyn-617ec072

 

Server version	EnableSkypeUI  setting	Client experience
Skype for Business Server 2015	Default	Skype for Business
Skype for Business Server 2015	True	Skype for Business
Skype for Business Server 2015	False	User asked to switch to Lync mode (user can switch to Skype for Business later if you change the UI setting to $true)
Lync Server 2010 or Lync Server 2013 (with correct patches)	Default	User asked to switch to Lync mode (user can switch to Skype for Business later if you change the UI setting to $true)
Lync Server 2010 or Lync Server 2013 (with correct patches)	True	Skype for Business
Lync Server 2010 or Lync Server 2013 (with correct patches)	False	User asked to switch to Lync mode (user can switch to Skype for Business later if you change the UI setting to $true)
Lync Server 2010 or Lync Server 2013 (without patches)	Default	User asked to switch to Lync client experience (user cannot switch to Skype for Business later)