558.7mm is the maximum dimension that Word can handle whereas A2 is 420mm x
594mm. The best that you can do is use a Custom size of 420mm x 558.7mm.
If you want to use it often, create a template that has that sized paper.

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Hope this helps,
Doug Robbins - Word MVP
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how do i set the paper size in word 2003 to A2 as i have a canon bjc 5500
printer that is A2. word will only goes up to A3 apart from seting it as
custom page