Yesterday I had a play about with my Peppermint OS machine that I'd installed Edge on. Now Peppermint OS has a tool called ICE that lets you easily create Site Specific Browser instances. Essentially a web based application. Obviously, this tool doesn't yet cater for Edge. But, I thought I'd test if it worked. So, I created a desktop file for www.office.com initially based on Google Chrome. I then manually edited the created file to use Edge instead. It works perfectly. Here's the resultant file.