Follows a request made by Senator Wyden to initiate measures against Microsoft
Chief exec apologises, but significant gaps remain in what is known about the attackers, the extent of the attack and why it took the commission so long to inform voters about it
Payload hidden in the memory of legitimate applications
Microsoft still says only Outlook and Exchange Online were impacted
Hacking group tells the BBC it does not have the data of UK household names thought to be victims of attacks on payroll software company.
Sold stolen logins, cookies, browser fingerprints and other information
Group used hacking, sabotage and misinformation
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