Microsoft revealed that a group of hackers (Hackers), sponsored by the Russian government, hacked into some of the company's email accounts, including those of “the senior leadership team and employees in cybersecurity, legal and other functions” to attempt to discover information about themselves.

Don't you want to know what the tech giants know about you?  And that's exactly what Russian government hackers want, too.  Microsoft said the hacking group it calls Midnight Blizzard, also known as APT29 or Cozy Bear, compromised the email accounts of some team members.
APT29 is widely believed to be a Russian hacking group responsible for a number of high-profile attacks, such as those on SolarWinds in 2019, the Democratic National Committee in 2015, and many others.
Hackers hack into Microsoft only to know about themselves
Interestingly, the hackers did not go after customer data or traditional business information that they typically go for.  They wanted to know more about themselves, or more specifically, He wanted to know what Microsoft knew about themaccording to the company.

The investigation indicates that they were initially targeting email accounts to obtain information related to Midnight Blizzard itself.

The company wrote in a Publishing On your blog.

According to Microsoft, hackers used "Password spray“—basically brute force—against an old account and then used that account’s permissions “to access a very small percentage of Microsoft email accounts.”
Microsoft did not reveal the number of email accounts that were hacked, nor the information that the hackers accessed or stole.  Microsoft captured the news of this hack To talk about how we can move forward to be safer.

For Microsoft, this incident highlighted the urgent need to act more quickly.  We will move immediately to apply our existing security standards to legacy Microsoft systems and internal business processes, even when these changes cause disruptions to existing business operations.
This will likely cause some level of disruption as we adapt to this new reality, but this is a necessary step, and just the first of many steps we will take to embrace this philosophy.

The company wrote.

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