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In an email message you're composing, on the Options tab, select Editor > Editor Settings.
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In the dialog, select Manage spellcheck languages.
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Select Add another language, then click the down arrow in the list box and begin scrolling until you find the language you want.
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Select the language name, then select Add. When you're through adding languages, select Done.
If your language isn't available in Outlook, see Language Accessory Pack for Office.
Note: For more info on adding and changing languages, see Add an editing or authoring language or set language preferences in Office.
