A desktop publishing application from Microsoft that focuses on page layout and graphic design.
Whether you can keep using Microsoft Publisher depends entirely on whether your Office package is a Microsoft 365 subscription or a perpetual (one-time purchase) license such as Office 2021.
If you use a Microsoft 365 subscription, access to Publisher will end on October 1, 2026. The Publisher application will no longer open, and you will not be able to open, view, or edit .pub files in Publisher. You should convert any important .pub files to other formats, such as PDF or Word, before October 1, 2026.
If you use a perpetual license, such as Office 2021 or standalone Office LTSC, you can continue using Publisher after October 13, 2026. The application will not be automatically removed or disabled, and you can continue to open, edit, and create Publisher files. However, when support for Publisher officially ends, there will be no future security updates, bug fixes, or technical support, which can increase the security risk of continuing to use the application.
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hth
Marcin