Very uncool; Microsoft even uses an URL shortener for most of their links (from windows etc) so that they can theoretically change where the user ends up at if the original page is replaced for whatever reason.

But they shouldn't. Microsoft especially should make all of their documentation pages plain static HTML pages and keep them available forever.

But also, any Windows documentation can live offline in the OS itself. At least nowadays, I get how in the windows 98 / XP era they wanted to reduce disk usage.