I'm not saying it WAS a scam, only that how it was worded was very suspicious. How many dodgy spam or outright virus links (especially fake bank ones) have you seen that said "Your [whatever] is closing: Action required" and then gave you a link to click on? And those were false, though they often hid behind genuine names/entities.

How on earth are we to know? I do think it was stupid of Yahoo to word it like that, and not simply give you click-instructions how to access your account. I STILL will never click on a link I know nothing about.