WINE already runs Office 2003 out of of the box for free since some time ago..
Personally, in linux or whichever OS is used, I've began using Open Office and recommend it to more people because even thought it can't obviously be as good as MS Office, at least the price tag is just about right - free of charge and I hope future versions only get better as more people use them.
Even 2007 is supported thought it will require some extra manual work - http://appdb.winehq....iVersionId=4992
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