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.

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.

Microsoft will start automatically installing its new Outlook email app on Windows 10 devices. It's already pre-installed on most Windows 11 PCs and rolled out to some existing Windows 11 systems.

Microsoft will automatically install its new Outlook client on Windows 10 PCs with next month’s Patch Tuesday update.

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