MS Poster wrote:

Thanks for the response. So if someone sends me a message from, say,
Outlook and they have decided to use 14 point Bookman, then my
response will be in 14 point Bookman?

In general, yes.

What is it that decides to make
the response both bold and italic? Is that the sender's formatting or
mine?

If you're replying, I'd say that the sender's settings tend to obtain, but
there are always exceptions. Stationery can affect it as well.
--
Brian Tillman [MVP-Outlook]