[2rsf]

I worked at Microsoft later than that and my team (most of the times there is no "Microsoft did X", it is a team, department or product decision) tried a variation on Zero Bugs policy. We either fixed immediately, closed as won't fix (and here there's the question of correlating future related bugs with different symptoms) or turn into a new feature request of the fix requires bigger changes but is still needed. It worked for a while, but as others said it is hard to maintain this policy over time for a complex product.