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Go to File > Options > Proofing and select AutoCorrect Options.
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On the AutoCorrect tab, select or clear Replace text as you type.
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On the Word menu, select Preferences, and then AutoCorrect.
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Select or clear Replace text as you type.
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Go to the Review and select the arrow next to Spelling & Grammar.
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Select AutoCorrect Options... and then select or clear Replace text as you type
Word for the web currently has a slightly more limited set of AutoCorrect Options than Word on the desktop does.