You can try the AppJetty Calendar 365 plugin.
It easily integrates with the Dynamics 365 (the rebranded version of Dynamics CRM 2016) and lets you create/manage appointments. You can even create calendars for your customers and share it with them, thereby, helping them prioritize their tasks.
The best part is that it would automatically sync with the CRM and provide real-time reminders so that no one misses out on an appointment.
You can learn more about the plugin here.
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