Hi,
I am Nallakumar. I have more than 11 years of experience in creating plugins for Outlook.
All the requirements are feasible.
Regarding different network path for different set of employees, we can do this in the installer, where we can ask which type of user and set the path accordingly. If you want to allow the user to configure this later, we can provide a settings button in the Outlook Ribbon.
Thanks,
Nalla