For compliance purposes, the Microsoft 365 substrate captures copies of Teams messages in Exchange Online mailboxes. The compliance records are indexed and discoverable, which means that they can be found by content searches. However, Teams compliance records are imperfect copies of the real data, which is a fact that seems to have escaped many people.
Microsoft announced the retirement of legacy eDiscovery tools from Office 365. The Exchange Online in-place holds and eDiscovery tool, Office 365 Advanced eDiscovery 1, and the Search-Mailbox cmdlet are being retired. All will be gone by mid-2020. It’s a pity to see the Search-Mailbox cmdlet being removed, but time and progress make this kind of thing inevitable.
At the Microsoft Ignite 2019 conference, Microsoft described how SharePoint Online will use Office 365 compliance features such as sensitivity labels and information barrier policies to better protect information stored in SharePoint sites. The Office Online apps also gain support for sensitivity labels. The new features will enter a mixture of public and private previews starting November 20.