If you get an Unhandled Exception in your mailbox profile alerts, but no real information, where it comes from, then this post will help you.
While trying to enable and test the mailbox of a user, I got the following error message:
Appointments, contacts, and tasks can't be synchronized for the mailbox *** because the mailbox user doesn't have sufficient permissions on this mailbox.
Email Server Error Code: Crm.80048306.Not enough privilege to access the Microsoft Dynamics 365 object or perform the requested operation.
If you connect your exchange mailbox with crm, you might already have appointments in your mailbox. Also, there might be some appointments in CRM. If you have an appointment in exchange and CRM at the same time, CRM will show you an alert, asking you if you want to import this. In my case, I …
Have you ever had the problem, that a working mailbox is not synchronizing correct?