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> as short as legally possible

Does the law allow you delete communications after some amount of time has elapsed?

Yes, but that amount of time is measured in years to decades.

the baseline is you're not required to store anything. some communications must be stored for varying numbers of years, but this e-mail doesn't appear to be anything of that sort. https://www.uschamber.com/co/start/strategy/how-long-to-keep...

Microsoft is a publicly traded company. They have to keep emails for a minimum of 7 years under SOX compliance.

P.S. The US Chamber of Commerce is NOT part of the US Government and you should not trust what they say.