Configuring preferences and options in Outlook.com
'use another program' is definitely a solution to the problem, as you suggest
or, at least, another email system.
for example, my gmail account doesn't have this abhorrent feature that can't be disabled.
gmail also seem to listen to end-users, rather than pushing this to a 'contact your local systems administrator, or hope someone in the community has a solution' as this site does. good grief.
abandoning outlook seems like the reasonable way to having functional email for those of us who work in symbols and who don't want parsed fontfaces and emojis.
i hope you and ms can sense my aggravation about this.