You can add Google Calendar to Windows 11 Taskbar by creating its desktop shortcut using Chrome, Edge or Firefox. We have explained this in detail in this article.

If you use the Google Chrome browser, here's how you can add a multifunction clock to your desktop: First, install the Clock app by Google, from the Chrome Web Store.

Internet Explorer 9 famously lets you add Web favorites to your taskbar, but Windows has always had the option of adding them to the desktop.