Comment by paxys
By 2011 Apple had launched iPhone 4s, Android manufacturers had sold 100M phones, and HP's latest and greatest mobile device looked like this - https://fdn2.gsmarena.com/vv/pics/hp/hp-ipaq-glisten-1.jpg.
They simply had been asleep at the wheel for too long. And even then, the correct move would have been to adopt Android instead of thinking you could build and control your own ecosystem (something they finally did in 2014).
https://en.wikipedia.org/wiki/HP_Veer and https://en.wikipedia.org/wiki/HP_Pre_3 could have been great, if they had been well supported.