You have a Microsoft Office 365 ProPlus or Office 365 E3 subscription. In the Office 365 portal, you click Install for Skype for Business 2016 on the Skype for Business tab of the MySoftware page. After you activate the installation, you notice that all the Office 365 ProPlus applications are installed, instead of just Skype for Business 2016.
Note This doesn't occur for Office 365 Business Premium subscription users.
To install only Skype for Business 2016, you have to use the 2016 version of the Office Deployment Tool (ODT) for Click-to-Run.
Microsoft is aware of this behavior, and we are working to improve this experience. This issue occurs because the Office 365 ProPlus and Office 365 E3 subscriptions don't include entitlement for the Skype for Business product that's currently offered from the Skype for Business tab.
This issue doesn't occur when Microsoft Lync 2013 or Skype for Business 2015 is installed from the Skype for Business Tab. During activation for these productions you're prompted to "Choose your product" and are presented with the option to install Office 365 ProPlus. If you exit without completing "Choose your product," Lync or Skype for Business will not be activated.