What occurs if tzmove runs on a mailbox with affect time zone (ie. EST) multiple times?

Q: What occurs if tzmove runs on a mailbox with affect time zone (ie. EST) multiple times?
A: Please review blogs.technet.com/dst2007/archive/2007/03/01/if-i-run-the-rebasing-tool-client-or-server-multiple-times-will-single-instance-appointments-be-moved-more-than-once.aspx