Minimum Mailbox rights required for Office 365/Outlook.com/Exchange message processing
By Daniel Horton @daniel.horton
The minimum rights that are needed for the User assigned against your Mailbox for Office 365/Outlook.com/Exchange are as follows:
- User.Read
- Mail.ReadWrite
- Mail.ReadWrite.Shared
Without these rights your authentication is likely to get a 403 Forbidden by the mail server.