From a REVIEW SITE."Con: Security comes at the cost of usabilityThe resilience of Windows 10 S mode comes with several drawbacks.As mentioned above, you can only install apps from the Windows Store. That may not seem like a big deal at first (because surely the apps you need will be in the Windows Store), but there are a lot of things professional users need that are downloaded from the web or installed using other app management platforms.S mode means no Adobe software, no Apple apps, no non-Microsoft video conferencing apps, limited to no third-party security software--in short, if it comes to a Windows PC via a third party it doesn't come to S mode at all.That includes web browsers and that's a deal killer for many people. Windows 10 S mode users are stuck with Edge as their browser and Bing as their default search engine. To further restrict browsing matters, even if Chrome or Firefox were installed on an S mode computer it couldn't be set as the default browser, nor can the default search engine be changed. "