Designed to replace the current Mail and Calendar apps, the new Outlook can only be removed after it's been installed.

Microsoft announced last year that it would be retiring the Windows Mail & Calendar apps in favor of the new Outlook at the end of 2024. As of January 1, these apps are no longer functional and will refuse to send or receive any more emails.

Microsoft will force install the new Outlook email client on Windows 10 systems starting with next month's security update.

Come Patch Tuesday in February 2025, Microsoft will be tightening down even further. According to BetaNews, February will usher in a new phase in Outlook’s migration where Windows 10 users will be forced to install the new Outlook app on their PCs.

The good news is that the February update which brings the new Outlook doesn't strip out the old version of the app, so you can still use that.