# Microsoft’s Tay chatbot was taken offline roughly 16 hours after launch > Source: > Published: 2026-10-28 19:45:22+00:00 It was suspended after posting inflammatory tweets, and Microsoft blamed a coordinated attack that exploited a vulnerability. Microsoft’s own post-mortem said it had prepared for many types of abuse but made a critical oversight for this specific attack. [Wikipedia]()[VICE](https://www.vice.com/en/article/microsoft-is-deeply-sorry-its-artificial-intelligence-bot-became-horribly-racist) Prepared for many attacks is not the same as tested against adversaries. What a red team would have probed before launch: → Repeat-after-me style instruction hijacking → Coordinated, multi-user pressure on a learning loop → Escalation across many turns, not one bad prompt Would your agent survive its first 16 hours with real users?