Office 365 enterprise E3 is a service that provides features of Office LTSC 2021 (with the LTSC standing for Long Term Service Current) to the users who are using Microsoft 365. These users will have to provide a valid plan number, but will use this service if they don't want to use Office 365 Apps for enterprise. It is not possible to download Office 365 Apps for enterprise from Microsoft using the free Microsoft Volume License (MSVL). See this Technet article for more information.
Microsoft 365 is the subscription-based version of Office 365. For most companies, Microsoft 365 Enterprise is the most cost effective option. This includes the Office 365 Enterprise E3, Exchange, Skype for Business, and Universal Windows Platform (UWP) applications.
Office 365 Enterprise E3 is an Office 365 subscription that provides a complete suite of Microsoft Office applications. You can interact with these applications from two perspectives: as a user or as an administrator. The users in the organization will have both Office and OneDrive for Business. The administrators in the organization will have only Office, and will have additional administrative controls via the Office 365 administration portal. 7211a4ac4a