In plain English
Microsoft Teams is the primary collaboration hub for most Microsoft 365 organisations. Chat messages, meeting recordings, shared files, and third-party app integrations all live in Teams — making it a significant data governance concern. DLP policies, sensitivity labels, and Defender for Office 365 all extend their protection into Teams to prevent sensitive data exposure through chat or file sharing.
Full definition
Teams has become the central nervous system for most organisations. Chat threads, meeting recordings, shared files, and third-party app integrations all flow through it, which means a poorly secured Teams environment is not just a communication risk. It is a data governance risk too. An employee can share a sensitive document in a Teams chat and bypass every permission you have set up, if the right controls are not in place.
From a security standpoint, policies extend into Teams. You can block someone from sending a file containing credit card numbers or Australian Tax File Numbers through a chat message. apply to Teams channels and meetings, restricting who can join or record. scans files shared in Teams for , the same way it scans email attachments.
Guest access is where most organisations get caught out. Teams makes it easy to invite external parties into a channel for a project, but guest accounts linger long after the engagement ends. A guest who was added for a six-week construction project may still have access to your files twelve months later. Regular access reviews through ID, or automation via lifecycle workflows, are the practical fix. Data governance in Teams needs to be revisited as the organisation grows and as Microsoft adds new features.