Emails Not Recoverable and Litigation Hold Limitations
I had a staff member purposefully delete the sent items and deleted items of client emails that they forwarded to unknown recipients. I logged a call but Microsoft is unable to recover the emails that were deleted. Legal cases cannot be successfully won because of this. All emails must be retrievable on mailboxes, regardless of how users delete them.
I was then told about Litigation Hold, which is now active on some staff - but the functionality is not available to Exchange Online users, it is only available for E3 users. This is a huge business risk as contractors can do the same nefarious behaviour. Litigation hold must be available regardless of the email license used.