Clear area for disruption here. But it's IT stuff, so no one wants to touch it because it's not a cool selfie app.
It's all fun and games untill 2000 users cannot log into their machines because your new shiny active directory replacement didn't work.
Especially as they get more and more attention from the military-industrial complex.
And then they made AD, and extended the LDAP spec so that 3rd-party clients had a hard time working with it. But I digress.
Microsoft continues to exist because they can setup a system -- for many millions of dollars -- that allow a Fortune 500 to lock down PC's to the point of, say, not allowing users to change the desktop background. And CIO's nod their heads, stroke their chins, and say, "Yes, we need this. Our data is INFINITELY valuable. The files we create in the course of manufacturing something that can easily be bought, disassembled, measured, and knocked off in China, needs AS MUCH PROTECTION AS I CAN POSSIBLY SPEND MONEY ON. Oh, and 'SOX'! Feel free to make the users' workflow as miserable as possible."
In my opinion, this is why Windows Phone didn't make it. Microsoft's continuing vision is in letting someone ELSE control your computing devices. A phone is too personal for that.
Azure has provided enough of this IT-end-user-abuse-control such that big companies are following right into their cloud product. For this, all I can do is tip my hat to Nadella. Well played, sir. Well played.
The latter will make them love Outlook.
They value their business and possible legal consequences, in case there is a data breach coming out of Gmail or similar online services.
Of course companies that don't care about NDAs compliance, medical data, critical research information, offshoring of customer data, the upcoming GPDR 2018 and similar laws, can put their internal data wherever they feel like.
I started my career with an employer which used Lotus Notes and has quite a bit of investment with custom Domino apps.
I'm glad that's in the past.