In a blog post, Microsoft points out that the Microsoft 365 apps will no longer be supported on Windows 8.1, Windows 7, or Server 2008 R2 with Extended Security Updates (ESU) from January 10, 2023. Office applications can also lose support if they are still within the lifecycle but are running on an operating system that is no longer supported. Microsoft does not support the Microsoft 365 apps on this server OS. This is currently the only upgrade path for companies that want to use Office applications on a Windows Server 2022-based terminal server. However, it will be able to connect to Microsoft 365 services until that date. But this version will inherently only get five years of support, i.e., until Oct. Those who don't want to switch to a subscription version after the end of life for their current Office apps can still update to Office LTSC 2021.

Office LTSC 2021 is the only option for RDS Since Office 2019 users received a shorter support period of seven years for their software, the effective lifecycle of these applications shrinks to five years if companies want to access Microsoft's online services. Instead, users will get no support in case of connectivity problems.

Update: It seems like Microsoft will not actively block these versions from using M365 services. Office 20 will still receive support until October 14, 2025, but will no longer have access to Microsoft 365 services as early as October 2023.

The opposite is true for the two newer versions in the Long-Term Servicing Channel. Until then, the apps are still allowed to connect to Microsoft 365 Premature end for Office 20 End of support for Office 2013 SP1 on April 11, 2023.

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