[franga2000]

Not a website, but...Windows 10?? Highest market share OS, billions of $ worth of engineering time behind it and due to recent changes, search is pretty much a core feature of the OS. And I'm not even talking about file search here, which is indeed a hard-ish problem (although `locate ... | grep ...` seems to do well enough on Linux) - this is just a simple word search through a list of programs that's usually under 100 items long. And it's still broken most of the time.

Then there's MDN - a documentation site, whose 2nd most important function should be search. Yet, despite DuckDuckGo (a general-purpose search engine!) consistently finding the exact results I want, MDN's built-in search often misses even titles that are searched for verbatim.

If it weren't almost 2am and I weren't running almost entirely on caffeine, I'd probably be able to think of a few more.

[alpaca128]

Windows 10's broken search is on Microsoft.

When you can download a freeware tool that will find any file in the system instantly after maybe a minute of indexing you know the file search is not the problem here.

Just a month ago the only reason I could start a recently installed MS Office package on Windows 10 was its tendency to list newly installed programs first in the start menu. It did not show up anywhere else, could not be found by the search and Word could not even be set as default program for a file because the OS didn't seem to know of its existence.