Action

You can check your email quota in Outlook on the web via https://outlook.office.com/mail/options/general/storage

Instructions

1. Open Outlook. 
2. Right click on Inbox.
3. Select Properties.
   
   
   
4. Select the button Folder Size.
   
   
   

5. A window will then appear showing your total mailbox usage.  The information will appear
   in KB instead of GB.  Your quota is roughly 50,000,000 KB.  
   

   Alternatively, you can have Outlook always display your overall free space at the bottom of the screen.

6. Right-click on the Status Bar at the bottom of your Outlook window:
   
   
   
7. Click Quota Information:
   
   
   
8. The Status Bar will now display how much free space is remaining in your mailbox: