"Current and previous major releases" is a peaceful approach. There is no discretion involved - at no point was an active decision made to cut off your IE 7 us

"Current and previous major releases" is a peaceful approach. There is no discretion involved - at no point was an active decision made to cut off your IE 7 users. Plus, your FF 4 users will know exactly when FF support will be dropped - the day FF 6 is released. Simple.