This one is more of a pet peeve of mine, but the junk mail filter at Hotmail is definitely getting dumberer all the time!
I don't have junk mail here because I just deleted 34 of them, stupid! That also includes one VERY obvious one in my inbox! >:-(
I must say that for the first EIGHT YEARS of using my Hotmail e-mail address, which was basically my only one, I got maybe 1 or 2 spam messages a month, sometimes less! Awesome! Then they "upgraded" their system and I got flooded, sometimes getting 7 or 8 a day. Not a lot for many people, but a massive amount for me, considering how amazingly well I'd done all those years. It eventually went down again to maybe 1 or 2 a day, but now I'm back up to 5 or 6 a day after another "upgrade." I swear they have the dumberest junk mail filters on Earth!