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Enter a record including outside mail address on [Optional Attendance] or [Required Attendance] for [Appointment].

On Web browser, [The following recipient is outside your organization. If you save this Appointment, these recipients receive messages.] is displayed.
On Dynamics 365 for Phones, [ExchangeSyncAppointmentPrivacyWarning] is displayed.

These messages are included on same line in [Display strings] sheet in Appointment entity translation file (CrmTranslations.xml).
C column is displayed when it's Web, and B column is displayed when it's Dynamics 365 for Phones.

It would be great if [The following recipient is outside your organization. If you save this Appointment, these recipients receive messages.] is displayed on Dynamics 365 for Phones as well.
Category:
STATUS DETAILS
New