Here's a problem with Microsoft Word that's bugged me for ages.
Quotation marks in Word
Sometimes I write a document in which I quote either another document (a book, for example), or report direct speech. I might do this with single-quotation marks (') or with double-quotation marks ("). It's useful to have the choice here, because you sometimes quote a document in which something else is also quoted. Having single and double quotation marks allows or this to be made clear.
"She said, 'What's that you're eating?'"
as opposed to