For a word processor, even a 22.75in page width is exceptionally wide. A0 paper size is 841X1189mm (33.1× 46.8in). When you're using pages that large, a word processor is probably not the right tool for the job. However, since you're using Acrobat, you could scale everything down for slightly smaller than an A2 paper size and let Acrobat handle the re-scaling when you want to print on A0 paper.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]