That is part of what Office 365 is all about. Before I retired there were team projects which required considerable collaboration between for example design engineering and test engineering (my group). My assembly and test facility was a few blocks from main manufacturing. Frequently my group worked with other groups and documents be they Word, Excel or Outlook were placed on a server where they were shared and modified by everyone working the project. We worked under a secure server network nationally. Today the "Cloud" is the answer on a global basis. Additionally we used Info Path extensively but the goal was to be able to collaborate and work as a team using the software and networks we had available. I also did have my own designs and documents I was working on only as myself so obviously those files weren't shared and when I retired I gave over 3 months notice so those replacing me could learn what I was doing and function on the teams I was working with. Being able to open and share documents within the organization was a big plus.I generate PDF files for sharing when I can. The problem is that I am in an environment that sometimes requires me to collaborate with the development and maintenance of Word documents, so refusing to share modifiable documents simply is not an option.
Ron