Press Control and click the Skype icon at the same time. To uninstall Skype for Business on a Mac computer, sign out of the app and then close the sign in page.
If you see the Are You Sure You Want to Uninstall Skype and all its components box, click Uninstall and then click Close once the process is completed. If the app isn’t listed, it means the version you’re using is integrated with other Office apps. Right-click Skype for Business and select Uninstall. Open Control Panel > Programs > Programs and Features and click Uninstall or change a program.
