Microsoft 365 Copilot

Barclays runs Microsoft 365 Copilot on 100,000 desks and gives Claude the countable work: a knowledge assistant, 120,000 emails a day and half its developers. It has published usage, not results.

Microsoft's rebuilt Copilot keeps chat and Office features on the $30 seat and meters Autopilot, Code, Cowork and the Fable and Astra models in Copilot Credits. Set per-user limits and turn off Auto-apply before it reaches your tenant.

A Copilot seat lists at $19 to $30 a month, but agent consumption, a credit pool that expires and per-gibibyte indexing decide the bill. One GitHub Copilot developer running a daily agent session costs $174 a month against a $19 seat.

M&T Bank's Copilot population has been published three ways in twelve months — 16,000 using, 17,000 deployed to, 15,000+ with access — while its own filings show headcount fell 928. None of those figures is weekly active users, and that is the only one a per-seat renewal turns on.

Microsoft now bundles Copilot Search free with a $30 Copilot seat and reaches over 100 connectors, so Glean has to beat it on the remainder rather than in the abstract. Dust has 12 connectors and replaces source-system ACLs with its own workspace spaces.

MemTrapBench tested five agent-memory frameworks against a no-memory baseline on multi-turn business dialogues. All five scored worse — 85.16% down to 71.17% at best on Gemini-3-Flash — because correct, relevant memories anchor the model to the previous task's framing.

Microsoft scoped its 'not affected' statement to one CVE. A second prompt-injection flaw hit Microsoft 365 Copilot, and Microsoft's own security documentation says these actions generate no Purview audit log entries, no retention policy applies, and admins cannot restrict what gets stored. Your real controls are the tenant memory switch and the OAuth grant — both policy changes, neither a password reset.