The Mailbox Sizes Over Time report shows you how the top 20 users’ mailboxes have grown in size over a specified period. The chart displays the mailbox size as a line graph, and you can show or hide specific users by selecting their names in the legend.

By default, the chart displays the mailbox sizes in megabytes. You can change this to instead display the number of items by selecting that option to the bottom left of the chart.
The Data Table
The data table lists each user, the size of their mailbox, and the quota status. You can add, remove or re-order these columns to display additional information such as Department.

This report can be filtered, allowing you to generate bespoke reports about the mailbox sizes in a particular Department, Country or any other category you choose.
As with all of the reports, this information can be customized, filtered and scheduled.

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