We had a $user who deleted ALL emails from a shared mailbox and you might notice that the option to recover deleted items is grayed out and you cannot select it.

We need to set a registry key to turn that option on.

Create a new DWORD value with the name ‘DumpsterAlwaysOn’ and a value of 1.

Easy via PowerShell:

You have to close Outlook and start it again and voila, you can restore items.

 

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