You definately have to watch out with word, I wrote my CV on one version of word, I then tested it on my laptop, which has another version, just to check that the formatting worked, which it did. No problem I thought.
I then proceeded to send out my CV to all and sundry, only to find that when I opened the CV on a third computer at work a couple of weeks later, it suddenly was one and a half pages long due to the column formatting being out of line (it looked terrible)
I am now a pdf convert!