The new Outlook app on Windows 10 is poorly received among users. Users have noted slower performance, cloud storage of emails, and invasive ads. Resources are available to learn about data usage and optimize the new app.

Microsoft previously only made this measure known via an announcement in the Microsoft 365 Admin Center. But as of update KB5051974, which is mandatory, the new Outlook app has been force-installed for Windows 10 users on versions 21H2 and 22H2.

How to prevent Outlook from installing with Windows 10 KB5051974, which is February 2025's big cumulative update (mandatory).

Microsoft has released the KB5051974 cumulative update for Windows 10 22H2 and Windows 10 21H2, which automatically installs the new Outlook for Windows app and fixes a memory leak bug.

Microsoft has released the KB5051974 cumulative update for versions 22H2 and 21H2, adding security fixes and patching a memory leak. However, as reports, the update also includes a surprise: the new Outlook for Windows app.

Windows 10 users now have a worse email experience, at least in the eyes of many who dislike the new Outlook. The latest update to the operating system includes security fixes, but it also installs the new Outlook for Windows app.

Prevent the automatic installation of the new Outlook app with the Windows 10 KB5051974 update . Regardless of the advantages Microsoft lists for the new Outlook app, there's a bi