This seems oddly specific and arbitrary. What if the engineering effort in porting it over is not economically viable?
For the email, can’t you write it anywhere? Difference is it’s not officially a draft in an email client.
The installer fails on wine last time I checked, but porting an installation from windows works fine, and the account and license connection is fine too.
Office 365 web apps (free), Office 365 the monthly updating desktop Windows version of MSOffice (not free)