A family of Microsoft word processing software products for creating web, email, and print documents.
If the document itself is meant to be A4, then A4 should be selected on the Paper tab of Page Setup for that document, and you should not have to use any scaling in the Print dialog. Go to File | Options | Advanced: Print and clear the check box for "Scale content for A4 or 8. 5 x 11" paper sizes" (many users report that this option does not do what is intended).