You can use Skype for Business to have group meetings without leaving your desk. Have voice-only meetings, video meetings, share your screen, and use instant messaging. Plus, it’s linked to the rest of your Office 365 suite, so you can start a call from any application.
Note: you will need to be logged into the Skype for Business desktop app in order for this to work. If you don’t have it installed, follow the steps outlined in Install the Skype for Business desktop app for Mac.