The Edit Series window is displayed if a repeating appointment or calendar block is edited and:

• there are future events in the series; or
• all events in the series are in the future

Selecting:

• Only this ...:
  • the Repeat field cannot be changed
  • changes are not propagated to other events in the series
     
• This and all future ...:
  • the Repeat field can be changed. This does not affect prior events.
  • changes to the event are propagated to all subsequent events
     
• The entire series
  • the first event in the series is edited
  • the Repeat field can be changed. This affects all subsequent events
  • changes to the event are propagated to all subsequent events