Consider this an evergoing brown study.

Mailbox (Discovery): Permissions, Open without “Full Access” Permission – Office 365

Tests as on 27 November 2014. Objective: Providing non-Full Access Permission on a Discovery Mailbox (Exchange Online) and opening it in outlook. You can have one of the following "Access Rights" on a Discovery Mailbox. FullAccess ExternalAccount DeleteItem ReadPermission ChangePermission ChangeOwner   Create a discovery mailbox This example creates a discovery mailbox named SearchResults. New-Mailbox… Read more