Most people that know what Kelvin is also know that is the same scale as Celsius, but that doesn’t mean its equally is convenient in everyday use.
The single best thing about the Celsius scale (and pretty mich the only thing that makes it better than Fahrenheit except of familiarity) is that 0°C is placed at the most impactful Temperature point for normal people.












This isn’t just about Emails though. Companies that went to outlook and teams most likely pivoted to the MS cloud options like SharePoint and azure.
Sure there are alternatives available, but all data on there would be lost. Even with backups, it would take months to get another system running and properly migrate everything.