Microsoft 365 and Office 365 work with any version of Skype for Business that is in mainstream support, which includes the latest version of Skype for Business 2016. Skype for Business compatibility with Microsoft 365 or Office 365 and your on-premises environment depends on the system requirements for your deployment: For more information about installing Office updates, see Install Office updates.To find out what version of Skype for Business you're using, see What version of Skype for Business do I have?.For the latest mobile client updates, go to the app store for your mobile client (iTunes, Google Play, or Microsoft Store) to view details and install updates.The information in this article doesn't apply to Microsoft 365 or Office 365 versions of Skype for Business, such as Skype for Business included with Microsoft 365 Apps for enterprise.For example, if you installed a volume licensed version of Skype for Business, such as Skype for Business included with Office Professional Plus 2016. The information in this article only applies to perpetual versions of Skype for Business that use the Windows Installer (MSI) installation technology.