Unfortunately not.

The sync that we provide is a 1-way feed. Changes made in WriteUpp are passed to iCal/Google Calendar but you can't change/create in iCal/Google Calendar and push appointments back into WriteUpp.

The reason for this is that our calendar supports extra information relating to the appt such as Type & Status that can't be specified in the other calendars, such as iCal or Google Calendar.
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