There are security flaws and then there are security flaws. This would be the latter:
Attackers are actively exploiting a newly discovered Microsoft Word vulnerability that could be used to gain remote access of your PC, Microsoft warned Monday—and even worse, the exploit can be triggered by opening or merely previewing a malicious email using Outlook's default settings.
The attack is delivered using booby-trapped Rich Text (RTF) files. Accessing or previewing a poisoned file with Word grants the attacker the same rights as the current user.
Making matters worse, Word is the default document viewer in Outlook 2007, 2010, and 2013.
Word 95 was the last version of that product I actually liked using, before bloat and internet-ification took it over.