@gamingonlinux what in the smegma coated sandwich is this? We're not swallowing it, Microsoft.
Funnily enough they're correct, if they don't clarify to whom it's most open.
Same as "Diversity is Our Strength". It's correct depending on who "our" is.
It's really not that deep. They're engaging in typical word magic by smuggling in common words that have dual meaning.
Using the normative definition of "most" and "open", that phrase is clearly nonsense as you pointed out.