How do you determine if the appointments are off before the rebase and how do you determine if they are right after the rebase?

Q: If your workstation has been patched and you have appointments past March 10th. How do you determine if the appointments are off before the rebase and how do you determine if they are right after the rebase?
A: Appointments created before patching the client are created using DST2006 rules. Appointments created after patching the client are created with DST2007 rules. When you run the Outlook or Exchange tools to rebase your calendar, it will move all recurring meetings made with DST2006 rules and all single-instance meetings (since DST rules are not recorded for them until after rebasing). Concerning it being correct, we advise that the meeting information be placed in the subject or body; if they didn't do that, you have not option but to consult the organizer.