Whether you're working a company, working for yourself, or just a home user - security should be a high priority for you. With computer crimes on a continual rise, security has become a top issue in every aspect of our computing. We have secure networks, secure e-mail, secure websites, secure hardware, secure software, and even secure mousepads (LOL - just jokin', but you know what I'm saying) all for the soul purpose of protecting our data from digital predators.
According to Darren Strange, 2007 Office Product Manager in the UK, states in his blog site Office Rocker! that Microsoft has made security "a key focus for every group", including Microsoft Office. Darren has an excellent post this topic, including security features in Office 2003 and in the upcoming version Office 2007.
If you want your Microsoft Office documents to be secure, this post will give you a good start in that direction. Afterwards, I encourage you to learn more about security in all aspects of your computing efforts (well, at least those you care about.)