Forum Discussion
Preventing Users from deleting emails from O365 Group Mailbox
You cant, Groups are not designed to offer read-only access. You can ensure that messages are not permanently deleted by enabling retention policies/hold on the Group, but that will still allow users to perform the delete action in Outlook/OWA.
Take into account that for retention policies you need Exchange online plan 2 and if you include Office 365 groups in a retention policy, both mailbox and site contents are retained.
https://support.office.com/en-us/article/overview-of-retention-policies-5e377752-700d-4870-9b6d-12bfc12d2423- Ok so after I create retention policy, where can I see the deleted emails (by users) for O365 group mailbox for future ref?
To get the deleted/preserved messages, you will be querying the mailbox via eDiscovery. Or via the newly introduced Get-RecoverableItems cmdlet: https://support.office.com/en-us/article/Delete-items-in-the-Recoverable-Items-folder-of-cloud-based-mailboxes-on-hold-Admin-Help-a85e1c87-a48e-4715-bfa9-d5275cde67b0?ui=en-US&rs=en-US&ad=US
- Not sure if there is a builtin feature that allows you to get the information about deleted e-mails
