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In classic Outlook, select File and choose Options.
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Select Mail > Spelling and Autocorrect.Â
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On the Proofing tab, select AutoCorrect Options.
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Under AutoCorrect settings, select the options you want and select OK.
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In a message you're composing in new Outlook​​​​​​​, on the Options tab, select Auto format options.
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Under Auto format options, select or clear any option as you see fit.
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Select OK to save your changes.
