A significant software glitch affecting Microsoft services caused widespread disruption across the UK on Friday, impacting everything from pharmacies and NHS services to police, courts, and schools.
Microsoft acknowledged the outage, which affected up to 430 million users in 74 countries, and warned that the issues could persist for another 48 hours. Engineers worked for approximately 20 hours to resolve the bug, which began around 6 p.m. on Thursday and crippled applications including Outlook, Word, Excel, and Teams.
Experts described the incident as a wake-up call, highlighting the profound risks associated with Britain's heavy reliance on a small number of powerful U.S. technology firms. Professor Junaid Arshad, head of computer science at Birmingham City University, noted the "cascading real-world impact on government and public services is immense."
Real-world Impacts
The disruption led to a variety of challenges. The National Pharmacy Association warned of delays to NHS prescriptions, while the email shutdown created difficulties for businesses, particularly on payday. Police were unable to collect crime reports online, directing people to use emergency numbers instead. Some organizations resorted to traditional methods like fax machines or paper records, as reported by NHS England.
At least 47 NHS trusts, 25 police force areas, and 116 schools reported problems. The GMB union indicated a "serious impact" on ambulance services, with staff unable to refer patients through normal channels, leading to a significant backlog, though emergency and life-threatening calls were unaffected.
GPs reported that Microsoft products are central to primary care, and the outage disrupted patient referrals to district nurses and hospital outpatient services. The judicial system was also affected, with some juries sent home and prisoners unable to arrive at court. Judge Maurice Greene of Manchester Crown Court remarked on the "dangers of our reliability on computer systems."
Homebuyers faced difficulties as entire chains of house sales were dependent on email communications between estate agents, banks, and solicitors. Estate agents advised clients to use telephones or even communicate in writing.
Global Reach and Financial Cost
The outage's impact extended beyond the UK. Australia's intelligence services, Singapore's tax authority, the Japanese government's IT system, and a jail in Colorado also reported affected operations. The global financial cost to insurers was estimated by Morningstar to be up to $500 million.
Microsoft's executive vice-president Charles Lamanna ruled out a cyber-attack and expressed regret for the disruption, stating that services were being gradually restored. An extended 48-hour window was implemented for delayed messages to arrive, though some intermittent issues were still anticipated.
Calls for Resilience
Lawmakers have raised concerns about the "lack of resilience in the UK's digital infrastructure." Dame Chi Onwurah, chairwoman of the Commons' science and technology committee, stated that the incident exposed Britain's significant dependence on a small number of U.S.-based technology providers for public services. Cyber minister Baroness Lloyd of Effra, however, indicated that frontline service delivery impact was limited and pledged a review of the incident.
Microsoft has committed to publishing a full post-incident report detailing the cause of the failure after recovery is complete. In the interim, scammers reportedly attempted to exploit the situation by offering to "help" victims and solicit passwords, while companies like Royal Mail used the outage for marketing.