Should I a) update to relect changes to windows time zones or b) move appointments created in the original time zone?

Q: What is the best choice with the tzmove when you have to select either: a) update to reflect changes to windows time zones, or b) move appointments created in the original time zone to my new zone
A: That would be A) Reflect changes to Windows Time Zones is generally recommended. You should only use the latter if a user is permanently changing time zones.