Microsoft Skype for Business for IOS

Microsoft has released Microsoft Skype for Business for iOS, v6.12.0.219
Download from here

Microsoft Skype for Business Server 2015: February 2017

Microsoft released Skype for Business Server 2015, v6.0.9319.277
See description in KB3061064 and download from here

Skype for Business 2016: February 2017

Microsoft released Skype for Business 2016, v16.0.4498.1002
See description in KB3141501 and download from here x86 or x64

Microsoft Skype for Business on Mac, February 2017

Microsoft released Microsoft Skype for Business on Mac v16.3.0.240

Download from here

Microsoft Lync 2013 / Skype for Business 2015: February 2017

Microsoft released Lync 2013 / Skype for Business 2015, v15.0.4903.1001
See description in KB3161988 and download from here x86 or x64