Zombies and skeletons won't pick up items on easy, normal and hard i testet out 200 zombies but it doesn't worked.

It didn't happen to me when I tested it with 1.4.4 pre-relase.You should update your game

In 1.4.4 skeletons pick up armor/weapons but zombies and zombie Pigman not.

@Mario Yes they can.I think you are just being unlucky.Try with different difficulties and with more zombies.Some zombies can pick up armor, some doesn't.And some of them can pick up items while others don't.It's just random

Possibly related to MC-3370

Zombies pickup weapons and armour and even spawn eggs etc in my testing.