OK here are some answers to the questions.
It is exactly the same in Excel and Word - I haven't used Powerpoint in this version.
CutePDF initially offers A5 as an option, but it disappears when I actually try to print.
Mr Optimistic - what do you mean by soft print options? If you mean the other options below my default printer, such as "Microsoft Print to PDF", then the answer is No none of them have A5 as an option.