FILE PHOTO: A Microsoft logo is seen on an office building in New York City on July 28, 2015. REUTERS/Mike Segar
WASHINGTON (Reuters) - The hacking group behind the SolarWinds compromise was able to break into Microsoft Corp and access some of its source code, Microsoft said on Thursday, something experts said sent a worrying signal about the spies' ambition.
Source code - the underlying set of instructions that run a piece of software or operating system - is typically among a technology company's most closely guarded secrets and Microsoft has historically been particularly careful about protecting it.
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