A family of Microsoft word processing software products for creating web, email, and print documents.
See Add-Ins in Microsoft Word and Normal Template in Microsoft Word - How to Find or Open the Normal Template. Jay Freedman laid out the steps for changing the default font in this thread. However that assumes that the normal template will save changes when you close Word. That does not happen if an Add-In interferes. On corporate systems sometimes a well-meaning IT professional sets the normal template to be refreshed (recreated) when the user logs in. The first two links deal with the Add-In problem. IT interference is beyond the scope of this site. You’ll have to deal with the office politics.