Another dashboard available to the reporting section of the Office 365 admin portal is the security and compliance reports. 

Note that as of February 2019, the lengthy security and compliance reporting has been replaced by a message prompting you to go to the reports dashboard in the security and compliance center. There are also exchange reports available under "auditing and exchange", but I'm expecting at some point that Microsoft is going to move all of these reports into the security and compliance center, so you can see them all in one spot. What you've configured in your environment will impact the reporting shown in the S and C. 

For instance, since I have no DLP labels configured, there is no usage data available for DLP. Further down, I can see the use of exchange transport rules, the number of malware instances attempted in email, as well as spoofing and spam numbers. There are other standard reports available to you, such as the amount of email sent and received over the last 30 days, and who your top senders and recipients are. Clicking on any of these report cards will allow you to delve deeper into the metrics and pull some potentially useful information from the data that has been collected. Of course, these reports are only as useful as how you use the data. Most of this might only be good to know for you currently, but it might be incredibly useful as forensic data to maintain security and raise awareness of user trends that might become problematic over time. Finally, clicking through some of these reports allows you to perform some additional functions, such as scheduling reports that get sent through email to the email address you specify. Click on the "create schedule" icon, and then choose your start date, and then choose the option to customize your schedule. 

From here, you can give your schedule a name, choose whether it needs to be weekly or monthly, and then when the start date and the expire date is, and then click "next". Under the filters, you can leave it as "default" to gather data from all users in your environment, or scope it down to specific users. Click "next" and choose your recipients, who you want to send the email to, then click "save" and then "finish". Once you've created a report or a scheduled report, it's available under "manage schedules" on the left hand side. You can go through different scheduled reports and delete them out of the schedule, or just simply keep an eye on them. Depending on the type of report that it is, you can also just click on the report card itself, and choose "request a report". Again, similar to a scheduled report, this picks a certain snapshot of time, click "next", click "filters", or leave it at the default, click "next", specify who it goes to, and then save. This report now will show up under "reports for download", and you can re-download it if you need to, or simply check your email for the report that you just generated.