Perhaps you want to select what all Appointments should be synced to Outlook and not all from Dynamics 365. You can simply have a custom filter control this behavior for yourself and choose which all Appointments should go over.
Add a new Two Option field in your Dynamics 365 Appointment entity which will specify if the Appointment should be sent to Outlook or not.
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Select which Appointments should be synced to Outlook from D365 CE – D365 Demystified
Select which all Appointments should be synced to Outlook and which should not!
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