Type this command then press Enter on your keyboard: quotareport
You should be presented with your quota summary, here is an example:
------------------------------------------------------------------------
ab1234 quota summary for volume Inbox: 0.02 MB used of 50 MB
The number of MegaBytes available to ab1234: 49.98 MB
ab1234 quota summary for volume Home: 49.998 MB used of 400 MB
The number of MegaBytes available to ab1234: 350.002 MB
ab1234 quota summary for volume Share-lun05: 1.024 MB used of 3 MB
The number of MegaBytes available to ab1234: 1.976 MB
------------------------------------------------------------------------
Another example where a quota had been exceeded:
------------------------------------------------------------------------
WARNING!! ab1234 over quota for volume Inbox: 51.229 MB used of 50 MB
The number of MegaBytes ab1234 must remove: 1.229 MB
Time remaining before ab1234 account is locked: 1.5 months
(NB: Exceeding the time limit or 350MB on the Inbox volume will cause email to be rejected.)
ab1234 quota summary for volume Home: 49.998 MB used of 400 MB
The number of MegaBytes available to ab1234: 350.002 MB
ab1234 quota summary for volume Share-lun05: 1.024 MB used of 3 MB
The number of MegaBytes available to ab1234: 1.976 MB
------------------------------------------------------------------------
The output varies depending your storage allocation is