Re:Wrong decision (Score 1)

Have you used Microsoft Office? It can't interoperate with its own older versions, ...

It can't even interoperate with newer versions. I teach math, and have Word 2008 for Mac OS. Students who hand in assignments edited in Word 2007 for Windows is unreadable, since math from Equation Editor is incompatible between versions. Both versions of MS Office saves in the "standardized" docx format.