The Skype for Business Client Devices per Month report shows the number of users who have used Skype on a particular device, per month.
Modifying the Chart
By default the information will be displayed as a line graph. You can also show it as a bar graph by selecting the icon to the bottom right of the graph. You can find more information on modifying the chart through this support article.
Changing the Date Period of the Report
When you first view this report it will show you the last 3 months of information. Use the Date Selection tool to display a different date range.
The Data Table
The data table shows each month and the number of people who had made an activity per device.
As with all of the reports, this information can be customized, filtered and scheduled.