Microsoft 365 outage burns through a year's worth of four-nines uptime before lunch
justin_hart · x · 2026-11-13
Microsoft 365 went down around 10 a.m. Pacific and took hours to fully recover. The author ran the math: a four-nines (99.99%) uptime promise allows just 52 minutes of downtime per year — gone before lunch. Even three nines (8.76 hours annually) would be exhausted by 6:46 p.m. A stark illustration of how one major incident wrecks a year of SLA headroom.
More from Infra
- Inkling 2 Small's width-4 sconv forces a tiny rolling 3-token conv cache per layer at inference — andrew_n_carr · 2026-11-13
- Microsoft outage ETA: cloud outage durations follow lognormal/Pareto, so expect it to last as long again — esrtweet · 2026-11-13
- SGLang Summit agenda: LinkedIn serves ads-ranking model at 10K+ QPS under 80ms latency — bgmshana · 2026-11-13
- Nvidia CEO Jensen Huang resigns over China spy scandal; Derek Thompson unpacks the fallout — zacharynado · 2026-11-13
- Microsoft mocked as outage explanation points to no reserve capacity — esrtweet · 2026-11-13
- Report: The End of the Jensen Huang Era at Nvidia After 30 Years — examachine · 2026-11-13