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In classic Outlook, select File > Options.
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Options are categorized by Mail, Calendar, Groups, People, and so on. Select a category, then change the setting you want.Â
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When you've made the changes you want, select OK.
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In new Outlook, go to the View tab and selectÂ
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Options are categorized by Accounts, General, Mail, Calendar, and People. Select a category and subcategory, then change the setting you want.Â
