As we all know, ediscovery is a very important process for admins in Office 365.
Now, this functionality is available under Security and Compliance in Office 365

In order to use it follow these steps:

  • Go to your Office 365 admin center.
  • Go to the drop down of admin centers 
  • Then click on Security and Compliance.
  • Then click on eDiscovery

Once we are here, we can go for Hold, search and export.
These steps are shown in details in the video below as step by step

I hope this will help you out.