A man stands watch outside the Microsoft office building in Beijing, Tuesday, July 20, 2021. The Biden administration and Western allies formally blamed China on Monday for a massive hack of Microsoft Exchange email server software and asserted that criminal hackers associated with the Chinese government have carried out ransomware and other illicit cyber operations. (AP Photo/Andy Wong)

Women wearing face masks to help curb the spread of the coronavirus walk by the Microsoft office building in Beijing, Tuesday, July 20, 2021. The Biden administration and Western allies formally blamed China on Monday for a massive hack of Microsoft Exchange email server software and asserted that criminal hackers associated with the Chinese government have carried out ransomware and other illicit cyber operations. (AP Photo/Andy Wong)

A security surveillance camera is seen near the Microsoft office building in Beijing, Tuesday, July 20, 2021. The Biden administration and Western allies formally blamed China on Monday for a massive hack of Microsoft Exchange email server software and asserted that criminal hackers associated with the Chinese government have carried out ransomware and other illicit cyber operations. (AP Photo/Andy Wong)

People walk through a park near the Microsoft office building in Beijing, Tuesday, July 20, 2021. The Biden administration and Western allies formally blamed China on Monday for a massive hack of Microsoft Exchange email server software and asserted that criminal hackers associated with the Chinese government have carried out ransomware and other illicit cyber operations. (AP Photo/Andy Wong)

A woman wearing a face mask to help curb the spread of the coronavirus walks by the Microsoft office building in Beijing, Tuesday, July 20, 2021. The Biden administration and Western allies formally blamed China on Monday for a massive hack of Microsoft Exchange email server software and asserted that criminal hackers associated with the Chinese government have carried out ransomware and other illicit cyber operations. (AP Photo/Andy Wong)

A man uses his mobile phone as he walks in front of Microsoft's local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out the cyber attack on Microsoft and charged four Chinese nationals over the "malicious" hack in March. (Photo by Noel Celis / AFP)

A man walks past Microsoft's local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out the cyber attack on Microsoft and charged four Chinese nationals over the "malicious" hack in March. (Photo by Noel Celis / AFP)

Pedestrians walk past Microsoft's local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out the cyber attack on Microsoft and charged four Chinese nationals over the "malicious" hack in March. (Photo by Noel Celis / AFP)

A man looks at his phone while outside Microsoft's local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out the cyber attack on Microsoft and charged four Chinese nationals over the "malicious" hack in March. (Photo by Noel Celis / AFP)

The Microsoft logo is seen at its local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out cyber attack on Microsoft and charged four Chinese nationals over "malicious" hack in March. (Photo by Noel Celis / AFP)

The Microsoft logo is seen at its local headquarters in Beijing on July 20, 2021, the day after the US accused Beijing of carrying out cyber attack on Microsoft and charged four Chinese nationals over "malicious" hack in March. (Photo by Noel Celis / AFP)

A man looks at his smartphone as he walks by the Microsoft office in Beijing, China on Friday, Aug. 7, 2020. The Biden administration on Monday, July 19, 2021 blamed China for a hack of Microsoft Exchange email server software that compromised tens of thousands of computers around the world earlier this year. (AP Photo/Ng Han Guan)