What does the tzmove.exe program do to appointments when it rebases calendar appointments?

Q: I have been able to export user time zone data. What does the tzmove.exe program do to appointments when it rebases calendar appointments? Also, will it be necessary to run this against users outside of an affected time zone?
A: The tool looks for appointments or meetings that occur during the extended DST period in 2007 and then adjusts them in the store (Exchange server, PST, etc) to meet the new rules. There is no value to running the tool against users in unaffected (time zone boundaries didn't change) time zones.