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.