[sophacles]

There was this one: https://en.wikipedia.org/wiki/Operation_Aurora

It seems that the level of access gained could have been used for a larger breach but fortunately the attackers had different motives.

[robocat]

Google banned Windows throughout the organisation in 2010 due to this (with some well fenced exceptions where Windows was unavoidable).

1. Google will do costly things to be secure.

2. At the time I did not hear of any other organisation following Google’s lead.

3. They did not reverse the ban later.

[joshuamorton]

Also, iirc P0 was created as a result of that breach.