FWIW, I use both Office 2003 & Office 2010 (often with apps from both versions running at the same time). Each version has its own strengths. With Word, 2003 does some things more easily than 2010, and vice-versa. Word 2010, though, does more than Word 2003 is capable of.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]