I hate when switches like these get advertised first and foremost as some huge cost-cutting measure, further solidifying open source ecosystem as some cheap knock-offs of their commercial alternatives.
How about instead you donate the same amount of money you would've paid to Microsoft anyways to fund open source projects you rely on? At least for one year, then drop it down to some arbitrary chosen percentage of that cost. That way you can still advertise it as a cost-cutting measure, and everyone would benefit.
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