As you type text, Word and PowerPoint can automatically change straight quotation marks ( ' or " ) to curly quotation marks (also known as smart quotes or typographer's quotes). And in Word, any quote following an em dash (—) is now formatted as an open quotation mark (rather than a closed quotation mark).
Turn smart quotes on or off
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On the File tab, select Options. In the dialog, select the Proofing tab, then select AutoCorrect Options.
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In the AutoCorrect dialog box, do the following:
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Select the AutoFormat As You Type tab, and under Replace as you type, select or clear the "Straight quotes" with “smart quotes” check box.
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(Only in Word) Select the AutoFormat tab, and under Replace, select or clear the "Straight quotes" with “smart quotes” check box.
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Select OK.