Office 365 Powershell: Report of largest inboxes

Hi Guys,

I'm looking for a way to check the "Inbox" folder (no subfolders) of all our users and sort the result by amount of data. I'm trying to see which people have the most emails/data in their inbox folder. 

I've been fiddling around with powershell but have not found an appropriate solution. Could someone help me out?