Microsoft 365, Microsoft's office and email software.
It went down for several days starting August 31, 2026. In October hacked Microsoft 365 accounts sent about 9,000 emails pretending to be staff at Japan's Nikkei.
Businesses and governments run their email and documents on it.
When it fails or is hacked, huge numbers of organisations are hit at once.
Aug 31 – Sept 1, 2026 — Microsoft confirmed an Outlook outage lasting several hours on Monday, Aug 31. A Microsoft 365 outage lasting several days was entering its second day on Sept 1. (techcrunch.com ; techcrunch.com)
Oct 4, 2026 — Nikkei apologised for a cyber incident, The Cyber Express reported. According to konbriefing, hacked Microsoft 365 accounts sent around 9,000 emails pretending to be employees. (thecyberexpress.com)