We had a shared mailbox that was constantly locking itself out in active directory. We could not find the root cause so we just renamed the account and created a new one along with an new mailbox. I exported the old email and calendar into a PST and copied it into the new version of the mailbox. Now all the calendar entries have the word "copy" in front of them and I have wondering if any calendar changes made to new account will reflect back to the old invites from the old account. Was there a better way to replace an active directory account??