You cannot use Office 2019 together with any of the previous Office versions or any of Office 365 apps (for example, you won’t be able to install Skype for Business Click to Run from Office 365).Office 2019 installer is based on Click-to-Run ( C2R) technology instead of the traditional MSI installer like the previous Office versions.You can install Office 2019 only on Windows 10 or Windows Server 2016/2019.Here are the main Office 2019 features you should know prior to deploying it in your company:
