Microsoft Graph Local Connector

A local connector for Microsoft 365 data that syncs Teams chats and mail using delegated auth, encrypted token caching, and privacy-first defaults.

Privacy-first local Microsoft 365 connector

Evidence and decisions

problem

Needed secure Microsoft 365 access without a heavy hosted middleware layer.

approach

Implemented local delegated auth, token protection, sync commands, and supporting tests and docs.

value

Makes Teams and mail data available to local tools while staying cautious about privacy and scope.

Overview

This case is about making Microsoft 365 data available to local tooling without introducing unnecessary hosted middleware. The connector uses delegated authentication with device-code flow, encrypted token caching, and metadata-first export behavior so the default stance remains conservative.

The implementation summary in the internal operations workspace shows a complete slice: auth module, Graph client wrapper, CLI sync commands, setup docs, quick start docs, and test coverage for the client and auth layers.

Delivery surface

Device-code authentication for local operators
Encrypted token cache with silent refresh
Mail and Teams chat sync commands
Date-filtered exports with pagination and retry handling
Test coverage across auth and client modules

Outputs and artefacts

JSON exports for mail and Teams chat dataDocumented setup and quick-start guidesUnit-tested auth and client layersA CLI surface for auth, config info, mail sync, and chat sync

Technology stack

MSALMicrosoft GraphPythonCLI toolingJSON exportsTests

Publication boundary

This page describes the system at a useful level without exposing client names, private records, credentials, or unverified commercial outcomes.

Next step

Want the build, not just the summary?

If this is the kind of system you need, the next conversation is usually about the workflow bottleneck, the smallest useful first version, and where the review loop needs to stay visible.