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.

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

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

Microsoft has made its Mail & Calendar app on Windows inoperable. A third-party app called Wino Mail attempts to fill the gap left by Microsoft.

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 decided to force install the new Outlook on Windows 10 starting with the new updates of the OS. You can quickly uninstall it after.

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.

For several months now, Microsoft has been urging Windows users to switch over to the new Outlook app, with classic Outlook recently getting an official “death date”. Many aren’t happy about this, holding off on jumping ship as long as they can — but the clock is ticking down.