Damage from a massive Microsoft outage could exceed $7 billion.
The Microsoft 365 outage began on the evening of November 12 and lasted more than 35 hours.
Millions of users around the world were unable to use Outlook, Teams, and Copilot.
The global outage affected hospitals, police, banks, airlines and intelligence agencies.
In the UK, police officers have had problems completing online applications, and medical facilities have switched to paper documents and back-up IT systems.
The outage affected exchange operator Euronext, IndiGo Airlines, Maim Akasa and Air India, as well as OpenAI and Anthropic.
One financial firm in Taiwan canceled the bond buyback, while another firm approved a faxed share trade.
Access to private users was restored on November 13. Corporate customers had to wait until the next morning.
Microsoft explained the incident as a faulty update that gradually overloaded the servers. There were no signs of a cyber attack.