Hi natral At least you've had an extra year and a half to use Clutter. For me, it stopped working as soon as Focused Inbox was introduced.
We've been speculating on this and other threads as to why Clutter was eliminated. I suspect that for some users, it was too aggressive in moving emails. For me, Clutter worked perfectly, but FI would move any email that was addressed to more than 2 people. Original Clutter may have done the same for some users, so MS probably got some complaints about people missing important emails. That, and wanting people to use the Outlook app - as if those of us who have more than one email account would switch from our chosen platform's native client!