Are Copilot audit logs enough as governance evidence?

What Copilot’s audit logs capture well

In a Microsoft 365 environment, Copilot interactions leave traces in the Microsoft Purview audit log: who used which tool, when, on which file. These are indispensable raw signals — the base material of AI governance in that environment. The question is not whether they have value; they do. The question is what they lack to stand as governance evidence.

Three limits, all checkable

1. Retention. Microsoft Purview Audit (Standard) keeps audit records for 180 days by default; Copilot activity records follow the same rule unless a custom retention policy applies, and ten-year retention requires a paid add-on. Evidence horizons, meanwhile, run in years: Law 25 has bound Québec municipalities since September 2023, and the AMF’s AI guideline comes into force May 1, 2027 — a first examination will look at the practice of the years before it. A log that expires after six months does not cover that horizon by default.

2. Custody. The log is held by the platform whose activity it records. That is a structural point, not a criticism: a history only carries evidentiary weight under independent custody. Microsoft cannot be the independent witness of its own AI — any more than an organization can be its own. The principle that makes an accounting ledger credible — separating the party that acts from the party that records — applies to AI as well.

3. Organization. A log is a stream of events; an auditor, a council, or an examiner asks something else: which AI systems are in use, what each can access, which gaps were found, when they were closed. Thousands of raw events do not answer those questions — an organized inventory and register, grounded in the history, do.

So what do you do with the logs?

Keep them, and make them last. Copilot and Purview logs are exactly the kind of signals a governance history must preserve: the useful move is to record them, as they happen, into a history that outlives the platform’s retention, cannot be rewritten after the fact, and is held by a third party.

That is what Agentica does with its first connector, the Microsoft environment: read-only collection — metadata and signals only, never the content of your files — recorded into a tamper-proof, append-only, hash-chained history under independent custody, then organized into an inventory and a register from which reports are generated on demand. The logs remain yours; the history turns them into evidence that lasts.