In 95 or maybe 96 I had access to a variant HP 200LX with an almost full MS DOS running on it which allowed a Nokia phone to be physically slotted into a modified display shell turning it into a computer-phone system. It ran a productivity app with contacts and calendar all integrated. It had almost the functionality of the not yet existing Nokia communicator.
The Nokia partnership with HP fell silent when the Communicator was released. Nokia never got much more productivity software running - Symbian slowed them down and the consumer business distracted them. RIM took over the segment for some time, iPhone was released and the rest is history.