Really? I hadn't ever known this. If true, this saddens me greatly...This means that even more of the global email traffic than previously thought is under/traverses google's infrastructure umbrella. </sigh>
Not that I want to use Y! Mail but it's the principle of the thing.
I know someone who works at a Microsoft subsidiary. She'll bring up using MS Lync, Teams, Skype, Excel or something and I'll be thinking "oh, most companies just use X." The few times I've used those Microsoft products I found them confusing and error prone...this also means I should spend more resources learning this. All of that would take away from my day job.
I can easily see not wanting to spend time investing in half baked calendars and conferencing taking resources away from consumer focused features.