How to check my M365 mailbox usage?

You can check your M365 mailbox quota and usage of Microsoft 365 Outlook Web App (OWA): Login your M365 account with Microsoft 365 OWA. Click “gear” icon  at the top-right corner of OWA window. Select “View all Outlook settings“. Click “General“, then”Storage“. The mailbox usage will be shown. Original Information Posted 6/18/21