How to generate Mail Size Report?
Perform the following steps to generate Mail Size Report:
Select Exchange Online Reports from the available vertical tabs. Then from left side of the application, select Mail Size Report under Mail Analytics.
For demonstration purpose, "Mail Size by Subject" report has been chosen.
On selecting "Mail Size by Subject" Report, a pop - up window is displayed as shown below:
 

     
  • Select the desired mailbox and Click on Next button.

     
  • Select the desired date range option and Click on Finish button.

     
During data collection, the window is displayed as shown below.
 

     
Once the data collection process is complete, the report data will be displayed in a report window as shown below:
 

     
Follow the above mentioned steps to run the other reports of Mail Size Reports.