I'm previewing my email newsletter in Litmus. Outlook is displaying my curly typographers quotes (both single and double) as straight quotes. However, if I do a live Interactive Testing the quote marks display as they should (without me changing any code). So Litmus Previews of Outlook show straight quotes, but in Interactive Testing curly quotes!

Which is it?

I'm using charset=utf-8 and “ and ” for the left and right double quotes.