Re: Voice dictation
Li Tan, you are absolutely correct -- the PDA never became extremely popular. And neither was Microsoft's tablet PC from the year 2000-2002 able to make this list, because its time in the ecosystem did not arrive as yet. For mobile devices, many technologies and environments had to progress before their true value could to utilized, for instance, processor technology, battery technology, screen and touch technology, connectivity (3G, etc.) and to a large extent, the cloud environment as well.
New types of mobile devices and services are only now beginning to be able to operate in the IoT because the ecosystem has progressed. However, these devices might have been invented or proposed, a long time ago.