Recover deleted emails from Office 365

We have an employee who has left and decided to delete all their emails and empty the Deleted Items folder before they left.
I can log into the Office 365 account in a web browser and when I right click Deleted Items I can select Recover Deleted Items.
The problem is that there are thousand of them. I can recover them one at a time but how do I recover them all in one go without clicking on the check box next to each one?
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Vasil Michev (MVP)Commented:
In OWA you need to do it one at a time. Configure the profile in Outlook, there will be a button to select all messages there. Make sure you have a recent version though, that feature was introduced few months back.

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