HOW TO Fix / Restore: Missing NT AUTHORITY/SELF from mailbox permissions and ANONYMOUS from a Outlook folder!

If by accident you deleted the NT AUTHORITY/SELF account from a mailbox in exchange here is how to fix it!

NOTE: You need PowerShell as admin to run below cmdlets:

1.RESTORE NT AUTHORITY/SELF Permissions
add-MailboxPermission -Identity "Cape" -User "NT Authority\SELF" -Accessrights FullAccess


2. RESTORE ANONYMOUS in a mailbox folder:
Add-MailboxFolderPermission -Identity username:\Inbox -User Anonymous -AccessRights None

The Exchange administrator can also manage Exchange mailbox folder permissions using the following cmdlets:

Get-MailboxFolderPermission
Add-MailboxFolderPermission
Set-MailboxFolderPermission
Remove-MailboxFolderPermission

The "Anonymous" user permission specifies default access granted to external users outside of your organization,

for example if you have domain trust, users in other trusted domains are granted access to the folder based on the "anonymous" permissions.

The "Default" user permission specifies the default access level given to others in your Exchange organization.

If set to "None", other users will not be able to view items. If set to "Free/Busy" other users will be able to know if you have an appointment during a specified time. If set to "Reviewer", others will be able to view the items in the folder without specifying them individually.

Regards,
Call2fixit