The suspects are a 63-year-old man in England, a 28-year-old man in Scotland and a 19-year-old man in Finland, police said.
"These men appear to be connected via an online company. We believe the suspects created and adapted viruses with the aim of causing massive infection by spamming," said Detective Constable Bob Burls, of the Metropolitan Police Computer Crime Unit.
The Finnish National Bureau of Investigation and the Finnish Pori Police Department cooperated in the investigation.
Microsoft gave notice to organizations using perpetual-license Office versions about a coming 2023 milestone that could result in iffy Microsoft 365 services connections in this Wednesday announcement.
Microsoft's ongoing layoffs are hitting its home turf, with new notices affecting 1,248 people in the Redmond, Bellevue and Issaquah, Wash. areas in May.
Microsoft on Tuesday announced a new predictive language chat tool for security experts called Microsoft Security Copilot.
Microsoft announced on Monday that it has rebuilt and improved the performance of its Microsoft Teams application, and released a preview of this "new" app for commercial Windows users.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) this week announced the release of a publicly available and free post-incident hunting tool for organizations using Microsoft Azure, Azure Active Directory and Microsoft 365 applications.
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