Have you recently upgraded to Word 2013? Documents created in earlier versions of Word are compatible with Word 2013, but the new features in Word 2013 will not be available in your older documents unless you convert them to the latest version.
Saving down an Illustrator file is one of my most common habits as a designer. Whether I'm making templates or creating a logo for a client, I always save my Illustrator files down to at least CS3, so anyone who has older software will still be able to open and edit the files I provide.
Much like InDesign, if you save a file in a recent version, like CS6, someone working in CS4 wouldn't be able to open that file. In this quick tip tutorial, I show how easy it is to save an Illustrator file down to an older version of Illustrator.You can check out the wedding invitation pictured in the tutorial here.