The Inactive Mobile Devices report shows you how many mobile devices synced with your Microsoft Office 365 environment during a given time period.
Changing the Time Period
The time period selector above the graph allows to to specify what constitutes an "Inactive User".
For example, if you click the 14 Days button the report will display all user mailboxes that have not logged in to their mailbox for 14 days or more.
The All Button
Selecting the All button will display a breakdown of the Last Logon times for all your user mailboxes.
The Data Table
The data table will show all Inactive Users within a certain time period as well as the mobile device they used to sync and the date of their last sync.
If you select the All button, it will display this information for all users.
Naturally this report can be customized, filtered and scheduled like all our other reports.