New Office 365 eDiscovery Tool :Security & Compliance Center
On July 1, 2017, Microsoft will disable the ability to create new In-Place eDiscovery searches and In-Place Holds (*-MailboxSearch) in the Exchange Admin Center in Exchange Online. We’ll also disable the creation of new cases in the eDiscovery Center in SharePoint Online. Instead, we invite you to use the Security & Compliance Center to fulfill your organization’s eDiscovery needs. In both cases, you will still be able to edit and run existing searches in the Exchange Admin Center and work with existing cases in the SharePoint eDiscovery Center.
Microsoft is decommissioning these eDiscovery tools because of their limited breadth across Office 365 services. The Security & Compliance Center supports permissions, cases, holds and exports as well as Advanced eDiscovery features such as Themes, Email Threading, Near Duplicate Detections, and Predictive coding. These changes only apply to the Exchange Admin Center in Exchange Online and the eDiscovery Center in SharePoint Online. On-premises and dedicated deployments of these tools will continue to be supported.
For more details please see here.