Microsoft Teams vs encrypted alternatives: why privacy actually matters
What Microsoft Teams encrypts, what it can still read, and what changes when messages and files are sealed on the device before they ever reach a server.
Try it in one click.
Three private surfaces. Same zero-knowledge architecture.
Two different definitions of "secure" Microsoft Teams is secure in the enterprise sense: hardened infrastructure, identity controls, conditional access, audit trails, data residency options and a large security organisation behind it. That protects you from outsiders.
Encrypted alternatives target a different threat: the platform itself, and anyone who can compel or compromise it. Both models are legitimate. They answer different questions.
What Teams protects, publicly Microsoft documents encryption in transit and at rest, with keys managed by the service (customer-managed key options exist within Microsoft's own key management). End-to-end encryption is available for specific one-to-one call scenarios, not as the default for channel messages and files.
This is not a criticism — it is a design requirement. Compliance search, retention, legal hold, DLP and Copilot-style features all require the service to read content. You cannot have server-side eDiscovery of message bodies and a server that cannot read message bodies.
What changes with client-side encryption - **Compromise surface shrinks.** A breach of provider infrastructure yields ciphertext. - **Insider risk drops.** No support tool, no admin console and no integration can read content. - **Legal exposure changes shape.** A request for content can only be answered with what exists: encrypted blobs. - **Offboarding becomes cryptographic.** Keys rotate; access is not just revoked in a database row.
What you lose - Server-side content search across the whole tenant. - Administrative content export. - Provider-side scanning, classification and AI features on the raw content. - Password resets that restore data. Recovery becomes your responsibility, backed by a recovery kit.
A realistic hybrid Most organisations do not migrate wholesale. A pragmatic split:
- Keep Teams for broad internal coordination, meetings with the wider company, and anything already governed by retention policy.
- Move the confidential surface — client matters, deals, patient data, unreleased product work, incident response — into a zero-knowledge workspace.
That split is easier to defend to a compliance officer than an all-or-nothing swap, and it puts encryption where the risk actually lives.
How DRIVUNO handles the confidential surface Rooms seal each message under a room key wrapped per member. Attachments are encrypted before upload and previewed client-side. Calls use peer-to-peer DTLS-SRTP with optional relay modes. Team Drive folders carry a folder key sealed individually to each member, so removing someone triggers rotation rather than a flag change. Security events are written to an immutable audit log — metadata, never content, because the content is not readable to us.
The question to take into your next vendor call "Assuming perfect intentions and a compromised server, what can be read?" A platform that answers "nothing but metadata" has made an architectural commitment. Everything else is policy.
Try it in one click.
Three private surfaces. Same zero-knowledge architecture.