Microsoft is slowly warning users of Office 2013, that support for it will end next year.. And that means security updates will no longer be available.

Office 2013 will reach the end of support on April 11, 2023. After this date, support for Office 2013 will end and security updates will no longer be available, per the Fixed Lifecycle Policy. This may increase your organization's exposure to security risks or impact compliance obligations.

Additionally, customers connecting to Microsoft 365 via an Office 2013 client may experience performance or reliability issues. Below is a list of Office products that currently support connection to Microsoft 365 (and Office 365):

• Microsoft 365 Apps
• Office LTSC 2021
• Office 2019
• Office 2016

Please start upgrading to Microsoft 365 Apps, which includes Word, Excel, PowerPoint, and Outlook. Alternatively, for organizations requiring a static, unchanging product, consider moving to Office LTSC 2021.