Microsoft: Office 2013 will reach end of support in April 2023
..”After five years of Mainstream Support, and five years of Extended Support, Office 2013 will reach the End of Extended Support on April 11, 2023. Per the Fixed Lifecycle Policy, after this date security updates for Office 2013 will no longer be available,” Microsoft told customers.
“After Office 2013 reaches the end of support, Microsoft won’t provide any new security updates, and the continued use of Office 2013 after April 2023 may increase your organization’s exposure to security risks or impact your ability to meet compliance obligations.”
Once the end of support is reached, Microsoft will stop providing several services to Office 2013 license owners, including technical support, bug fixes, and security patches for new issues.
Also, connecting Office 2013 clients to Microsoft 365 might lead to performance or reliability issues because Office 2013 is no longer a supported client since October 2020…
https://docs.microsoft.com/en-us/lifecycle/end-of-support/end-of-support-2023
