In the meeting request, right-click or tap and hold the Join Skype Meeting link, and select Copy Hyperlink. If the Skype for Business desktop version is installed, you can perform the follow steps to join the meeting with Skype for Business Web App.
After the download is done, you can manually install it. It works with Office 2011, Office 2016, Office 365, and Skype for Business Online. Until then, Lync for Mac 2011 is included with Office 365 and available for you to download and install. Install Lync for Mac 2011 - Skype for Business for Mac will be available in 2016. Get the Skype for Business mobile app Enter your phone number or email address and we’ll send a download link. Connect with your team anywhere using clients across Windows, Mac, iOS, and Android™, or bring remote participants into meeting spaces of all sizes with Skype for Business.