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Re:SolarWinds hackers were able to access Microsoft source code by macjohnmcc on Thursday December 31, 2020 @03:58PM (#25597041)
And it was not compressed it was just a bunch of files and folders. My guess is it was around 15 CD-ROMs
Re:SolarWinds hackers were able to access Microsoft source code by rbanffy on Friday January 01, 2021 @12:08PM (#25604666)
40 million lines of 80 characters would fit in 5 CDs. With a more reasonable average length, it'd fit comfortably in 3.

And 40 million lines for an OS is a crazy amount of code.