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

The apps will still work after Oct. 14, but users should be prepared for 'performance and reliability issues over time,' Microsoft says.

If you're still running Windows 10 and you subscribe to Microsoft 365, your Microsoft 365 apps will cease to function on Oct. 14, 2025, according to an official Microsoft blog post. This will happen when Microsoft ends Windows 10 support,