Microsoft is internally testing a new application called "Work Assistant," which might be one of the projects with which company founder Bill Gates is involved closely.

WMPU was the first to cover the new "Work Assistant" app. (I saw the WMPU report via Softpedia.)

The Work Assistant app, marked as a private internal beta, is designed to help users perform various Office-related tasks on Windows Phone.

One of my contacts confirmed that the Work Assistant application is being developed by Microsoft's Digital Life + Work group, which is part of the Applications and Services Group (ASG) run by Qi Lu. Julie Larson-Green, Chief Experience Officer of ASG, is believed to be spearheading the Work Assistant effort, and Gates has been involved, my source said.

Last week, during a Reddit Ask Me Anything (AMA), Gates said he was helping Microsoft work on a new "Personal Agent" project. While not offering many details, Gates said:

One project I am working on with Microsoft is the Personal Agent which will remember everything and help you go back and find things and help you pick what things to pay attention to. The idea that you have to find applications and pick them and they each are trying to tell you what is new is just not the efficient model - the agent will help solve this. It will work across all your devices.
Read more: Microsoft internally testing new 'Work Assistant' app | ZDNet