I used to work in finance where many top firms treat probation seriously (at least in my region). I've seen quite a few times that people didn't pass probation period, a situation which I don't want to get into.
Given MBB's "up or out" culture, are they serious on "probation", and how long is the official "probation period" stated on contract? Have you personaly heard anyone that didn't pass probation at MBB?