Office 2021 and Office LTSC for Windows and Mac FAQ

Microsoft 365 Apps for enterprise, the cloud-connected version of Microsoft 365, delivers the most productive and most secure Microsoft 365 experience—with the lowest total cost of ownership for deployment and management. However, for customers who can’t move all their devices to the cloud just yet due to inability to take regular updates, or have fully disconnected and secure environments, Office LTSC is available. Office LTSC is a one-time release version of Microsoft 365 apps, as with previous perpetual releases.

The Microsoft 365 and Office 365 plans combine the familiar Microsoft 365 desktop suite of premium apps with cloud-based versions of Microsoft's next-generation communications and collaboration services—including Microsoft Exchange Online, Microsoft SharePoint Online, Office Mobile, Office for the web, and Microsoft Teams—to help users be productive from virtually anywhere. Microsoft 365 Apps is the most secure version of Microsoft 365. Learn more about service plans in this article.