There is a fairly major Word file corruption issue that can happen with big Word files (in my case it was a file with embedded images), that has to do with Word's Auto-Recover system, and perhaps a conflict with Time Machine... not sure of all the details, but I had a major crash a week or so ago: couldn't even boot up so eventually had to take my MacBook Pro in to an Apple Repair place. The guy got it going, but told me to replace the hard drive.
I got the machine home, made a backup, and then (because it was continuing to operate and with my backup I felt safe to keep using it) searched the internet for info about a problem like the one I'd just had. Found something finally. Eleven pages long, and counting:
https://discussions.apple.com/thread/3504333?start=0&tstart=0
I'm not trying to scare you away from Word, which I prefer to Pages, partly because it's so commonly used. But beware that there's an issue, that seems to be with really big Word files. Maybe it'll be fixed with the next OS update.
Regards,
malch
From the thread it seems the issue is some sort of conflict between Autosave in Word and Time Machine with large files, resulting in file system corruption deep enough to hose the drive. Turning off one or the other seems to be the relief, though hardly a solution. This kind of thing should never happen nowadays. Interesting, but one of the dings some have against Pages is the lack of an Autosave feature. Is this the reason, perhaps?
One thing for sure, though: I'm glad I didn't try producing my book in Word. Not only does it lack the layout features I used extensively, the file was huge (over 80mb) when completed. If I'd lost that it might have been a lot of work down the tubes.
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It is a business decision. For the very low cost, try pages. If it works for you, you have saved money compared to word. If pages does not work for you, return it to apple and get word.
Doesn't Apple still include a trial version of iWork on all new Macs? If not, it's available for free download, for certain.