How do I install Skype for Business on my Mac?
Microsoft has officially released Skype for Business for Mac on October 26th, 2016. You can find the official download link here: https://www.microsoft.com/en-us/download/details.aspx?id=54108

If you are using Homebrew (and Cask), you can install Skype for Business for Mac with the following commands:

brew update ; brew cask install skype-for-business