Unfortunately, I brought some work home last night, then saved it Word 2007 format, docx. So when I brought it to work this morning, I realized I'm screwed.
A quick google search yielded me what I think is one of the greatest online utilities I've ever come across: Zamzar.
It's an online service that basically converts files between almost any conceivable format. I'm not kidding--the list is HUGE. Word processing, presentations, spreadsheets, charts, audio, video, everything. Thankfully, it converted my docx file to work on my stupid Mac at the office.
Thanks, Zamzar!