Not just Google envy: everyone envy.
Google has Android and all their consumer products. Apple has their vertically integrated fandom. Every social media platform is their own thing.
What do all those things have in common that MS has never been able to cultivate on their own? User data. MS decided to capture it by buying Skype and LinkedIn, both highly strategic because MS only understands business customers: those buys made sense to MS. What they don't understand, never have, and likely never will, is the end user. To capture that data, the only option they saw was to leverage their flagship product: Windows.
Wait, this sounds familiar...