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On the left navigation bar of classic Outlook, hover your mouse over
 People and a search pane appears. -
Enter a few letters of a name or email address in the Search People box.
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Classic Outlook shows you matching names. Select a name to open the person's contact card and see details.
Tip:Â To find someone who sent an email message, fromÂ
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On the left navigation bar of ​​​​​New Outlook, selectÂ
 People. -
Select the Search box in the title bar of the app.
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Start typing the first few letters of the person's first name or email address.
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​​​​​New Outlook suggests matching items, select the one you want to open the full contact information page.
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On the left navigation bar of Outlook on the web​​​​​​​, selectÂ
 People. -
Select the Search box in the title bar of the app.
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Start typing the first few letters of the person's first name or email address.
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​​​​​Outlook on the web​​​​​​​ suggests matching items, select the one you want to open the full contact information page.