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From your calendar in classic Outlook, open a meeting or appointment that you previously created.
If your meeting is a series, choose Just this one, or The entire series. -
Do one of the following:
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Reschedule one meeting or appointment: update the Start and End dates and times.
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Reschedule a series: select Edit Recurrence and then update the Start and End dates and times.
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SelectÂ
 Send Update or  Save & Close.
Note:Â You can only reschedule meetings or appointments that you created.Â
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On your calendar in new Outlook, double-click to open a meeting that you previously created.
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If the meeting is a series and you want to reschedule all instances, select Edit series at the top.
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Update the
 start and end dates and times. -
Select  Send.
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On your calendar in Outlook for Mac​​​​​​​, double-click to open a meeting that you previously created.
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If the meeting is a series and you want to reschedule all instances, select Edit series or Edit this and all following events.
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Update the
 start and end dates and times. -
Select Send.