If you're a microsoft 365 user, you will install skype for business via the skype for microsoft 365 installer. Around a month ago, skype for business started opening on start up. (no additional servers) how it works: This expansion means things will get much more vibrant when you. : Skype for business online customers will continue to use the service through the retirement date of july 31, 2021. Skype For Business Dark Mode Windows 10 : How to Enable Dark Mode in Skype App | Enable Dark Theme.