Nobody.
Actually it was a crazy idea, and indeed it still is, as it proved to be a sad story.
As big corporate appreciation requires, it started with Cook shaking the hands of a IBM lady Bozo. Ooaah, they'd have such a great future (so much affinity with each other... as much as ehh, physically possible)
But Apple was clueless about entering the corporate world and thought this was the easiest entrance.
IBM was clueless about its future with MSoft which didn't follow trends such as BYOD and exuberant consumer tech (iOS and Android)
But after several years now, what did this partnership of doubt bring to the user ?
Apart from a Highschool planning app, only the lowest level of integration of iOS and large corporate systems. Bascially, iOS with a few libraries implementing IBM protocols but they will hardly be ever used anywhere and obliviate. Who uses iOS as a UI for MRP, corp DBMS, GTRP, M&I systems ?
It's still separate worlds..
And now that there is little incentive and less to talk about, the mutual praise starts.
To underline wat it essentially is: mainly marketing fluff.