Microsoft Teams' end-to-end encryption covers only unscheduled one-to-one calls, is disabled by default, and does not extend to group calls, meetings, chat, or file sharing. For security-first enterprises in regulated industries, that is a narrow, optional layer, not a foundation for demonstrable, auditable security.
Microsoft's own documentation describes E2EE for unscheduled one-to-one Teams calls, where only the real-time media stream, voice, video, and screen sharing, is end-to-end encrypted. Chat messages and file sharing are protected using Microsoft 365 encryption instead, which is a different and weaker guarantee than end-to-end encryption.
E2EE must be explicitly enabled through an IT-controlled policy. The default configuration keeps it disabled unless administrators deliberately turn it on. Once enabled, Teams disables several advanced collaboration capabilities, and compliance recording is not available at all during an E2EE call.
For general business collaboration, this tradeoff may be acceptable. For security-first enterprises, it signals a deeper architectural limitation, not a minor feature gap.
Encryption is not universal. If encryption is opt-in, large portions of daily communication remain unprotected, either by design or by oversight.
User awareness is ambiguous. End users often have no reliable way to confirm whether a call or session is actually encrypted, which increases human-factor risk.
Metadata remains exposed. Even when E2EE is enabled, metadata, who communicated with whom, when, and how often, remains accessible. In regulated environments, metadata alone can carry legal, operational, or national-security sensitivity.
Legacy cryptographic foundations persist. Teams relies on DTLS (Datagram Transport Layer Security), which offers limited forward secrecy, no post-compromise security, and no post-quantum resilience, placing it behind modern secure messaging protocols designed to protect communications over long time horizons.
| Capability | NetSfere | Microsoft Teams |
|---|---|---|
| Consumer apps (WhatsApp, iMessage, Signal) | Personal, frictionless chat | No central admin, no compliance archiving/governance, data collection (varies by app), not defensible in an audit |
| End-to-end encryption coverage | Always on by default, across all messaging, voice, and video | Optional, limited to unscheduled one-to-one calls only |
| Enabled by default | Yes | No, requires administrator policy configuration |
| Coverage across group calls, meetings, chat, file sharing | Yes, applies universally | No, only the real-time media stream on eligible 1:1 calls |
| Compliance archiving alongside encryption | Yes | No, compliance recording is unavailable during E2EE calls |
| Post-quantum cryptography (ML-KEM / FIPS 203) | Yes, at the protocol layer | Not publicly documented; relies on DTLS with no post-quantum resilience |
| Centralized IT governance across all channels | Yes | Governance exists but applies unevenly across features and configurations |
Slack, Wire, TigerConnect, Wickr, and Rocket.Chat each address pieces of this problem, but none combine universal, default, enterprise-sovereign encryption with post-quantum readiness the way NetSfere does.
Bottom line. Microsoft Teams remains a strong collaboration platform for general business use, but its optional, partial approach to end-to-end encryption, paired with no credible post-quantum path, was not built for security-first, compliance-driven environments. End-to-end encryption only matters when it is universal, default, enforceable, and quantum resilient.
How NetSfere compares to Signal, Slack, and Wickr
Does Microsoft Teams have end-to-end encryption?
Is Microsoft Teams' end-to-end encryption on by default?
What do you lose when you enable E2EE on a Teams call?
Is Microsoft Teams secure enough for regulated industries?
What does NetSfere do differently?
