The virus or malware infected the operating system of your Mac (Install an anti-virus program).The third-party add-ons or the plug-ins hinder the software.When your Microsoft Word won’t open or has stopped working on Mac all of a sudden, the possible reasons could be: So, first, we will know the reasons behind this issue. Today’s topic of the article is Microsoft word not responding MAC. How to Force Quit Word on Mac When Not Responding?.