why last week in MI? (maybe you need an emoticon there to indicate you were joking?)
Even here in NJ there's still time to prune the apples since the buds are still closed tight. I have pruned them when buds have started to break, too -- a way to tell which buds are strong for directional pruning.
Especially for large/significant cuts, while they are dormant is best. But never cut frozen branches. If the temps were sub freezing overnight, wait until they have thawed later in the day. Local
"Sugar maple tapping and sugaring time" is generally a good guide if you are tuned into that.
Significant pruning during dormant period results in huge burst of rebound of stored energy from the roots during the growing season.
Growth limiting pruning -- little nips and tucks, and water sprout pruning -- can be done during growth, but avoid fireblight disease season. Here in NJ that's when the humidity is high between early June to late July/mid-Aug.