If you don’t want “…” to become an ellipsis or “—” to turn into a page-wide horizontal line, or if you dislike any other automatic “corrections” that Microsoft Office performs by default, follow these steps.
Type the word or character sequence you want to change–and stop typing immediately once the AutoCorrection has taken place.
You will see a small icon with a lightning bolt appear on the screen, next to the correction. Click the box and select the second option in the menu. That option’s text changes depending on the specific correction; for example, it will read ‘Stop Automatically Creating Bulleted Lists’ when you type a > symbol. Selecting this menu item once will terminate the autocorrection behavior permanently.
For more-detailed AutoCorrect settings, or to remove specific words from Office’s list of automatic typo fixes (if, for example, your last name is “Wrod”), click the Office button and go to Word Options, Proofing, AutoCorrect Options.
You should also look under the ‘AutoFormat As You Type’ tab for additional settings.