The correct answer is that Dante did not click the Save and Close button before exiting the appointment.
When you make a change to an appointment in the Outlook calendar you need to click on Save in order to have the change saved in your calendar. If you do not do this the appointment will revert back to the original time and date when you exit the program.
You need to attach a document of where i would read it from
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(Sorry for not being detailed)
