The Recipient Count Over Time report shows you how many recipients exist in your Microsoft Office 365 environment for each recipient type. These include UserMailbox, RoomMailbox and so on. You can choose which mailbox types to display by selecting their series items in the legend.

Changing the Date Period of the Report
When you first view this report it will show you the last 30 days worth of information. Use the Date Selection tool to display a different date range.
 
The Data Table
The data table lists the number of recipients for each type for each day.

As with all of the reports, this information can be scheduled.

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