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 KB5051974 patches DAC and USB issues, bundles Outlook web app in the start menu (direct download .msu)

Microsoft manifested something that had been a long time coming: forced installation of the new Outlook app on Windows 10 PCs by way of the February 2025 mandatory update. This is the next step in Microsoft’s push to make the new Outlook commonplace.