Installing on a university Mac
Open file manager (finder).
Choose your 'Applications' folder, then open the 'Managed Software Centre' application.
Find 'Skype for Business' in the list, and click the 'Install' button next to it.
Click the 'updates' button at the top, then 'Update'.
Skype for Business will now install.
Installing on a personal Mac
Go to the Skype for Business page on your Mac, and click 'Download'.
Once downloaded, open the pkg file.
When the installer window appears click 'Continue'.
At the software license screen click 'Continue' then 'Agree'.
Choose from the destination options, then click 'Continue'.
Click 'Install' to start the installation, which may prompt for your password.
When the installation is completed click 'Close' and move the installer to the trash.
Now lanuch 'Skype for Business' from your applications folder.
Type your university email address e.g. email@example.com, then click 'Continue'.
Type your password, then click 'Sign in'.
Finally confirm your university username and password, then click 'Log in'.
You should now be connected to Skype for Business.