https://www.linkedin.com/in/fowlerchad/ - CTO Wunderlist https://www.linkedin.com/in/jsoltero/ - Accompli founder https://www.linkedin.com/in/christianreber/ - Wunderlist Founder https://www.linkedin.com/in/pierrevalade/ - founder Sunrise https://www.linkedin.com/in/jeremylv/ - founder Sunrise/Design
They all got promoted really quickly and have large portfolios (including their original apps and teams) , but now with a mandate to fix the other similar core applications, too. If anything, this crop of teams and ppl now run huge portions of Office -- not the other way around. And they're the ones deciding strategic vision.
These acquisitions were also acquihires. The CEOs/CTOs have high leadership positions now (they went from Partner GEMs -> CTO/CVPs in about a year or so) and are trying to make all of Office better.
I think every time a MSFT article comes up, ppl get in an uproar. Give the company a chance and check your bias at the door.