M365 outage meets Copilot usage-based billing: enterprises land on using both Copilot and ChatGPT
Additional-Aioli4582 · reddit · 2026-11-14
Two events landed close together, sparking enterprise AI-tooling debate:
1. The Microsoft 365 outage: Outlook, Teams, and Copilot all went down. Microsoft said it was a network issue, "not related to cyber or AI / agents," but many people quietly switched to ChatGPT to keep working while Copilot was down.
2. Copilot billing change: Microsoft plans to turn on usage-based billing by default for new Copilot Business subscriptions bought through partners (scheduled early 2027) — still per-seat, but agent-style features consume credits on top, with admin-adjustable monthly limits per user.
The trade-off: Copilot is grounded in M365 data and stays inside Microsoft compliance, but is a single point of failure with harder-to-predict costs; ChatGPT is often stronger at reasoning and writing and works during outages, but needs separate data governance. Many orgs are landing on "both": Copilot for internal-data work, ChatGPT for thinking and drafting. The author asks how teams are handling tool choice and data boundaries.
Related event: Microsoft 365 Outage Hits Copilot as It Shifts to Usage-Based Billing(2 posts)→
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