If you’d like to get someone’s attention in an email message, you can type the @ symbol, followed by their name, in the email message. If you do this Outlook will automatically add them to the To line of the email and they’ll see the @ symbol next to the message in their Inbox.
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In the body of the email message enter the @ symbol and start typing the contact’s first or last name.
From the suggestions, choose the contact you want to mention. By default, the contact’s full name is included and added to the To: line.
You can delete a portion of the mentioned name, for example, everything other than the person’s first name an it will still work.
Send the desired message.