Local search, a simple and core feature of any OS, is used for a different agenda in Windows 10. It sends every single query and result back to Microsoft's servers for them to sell and monetize. As if that wasn't bad enough, it was recently discovered that Microsoft is pervasively forcing suspicious "updates" to the basic search box. Yesterday, an "update" made the search completely unusable for hundreds of millions of Win10 users. Now Microsoft is lying about it blaming a "server issue" instead of admitting to hijacking PC's for profit.
This is just another reason to NEVER use Win10 over the alternatives.