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In classic Outlook, select or open the message you want to reply to.
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On the Home or Message tab, select
 Reply to reply only to the sender, or  Reply All to reply to all recipients. -
Type your reply. You can add or remove recipients in the To, Cc, and Bcc fields. Select Options >
 Bcc, or the ellipsis ( ) >  Bcc to add the Bcc field. -
Select Send.
Tip: To add a custom signature, see Create a signature.
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In new Outlook, select or open the message you want to reply to.
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On the Home tab, select
 Reply or  Reply All. -
Type your reply. You can add or remove recipients in the To, Cc, and Bcc fields. Select Options > Bcc to add the Bcc field.
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Select Send.
Tip: To add a custom signature, see Create a signature.
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In Outlook for Mac​​​​​​​, select or open the message you want to reply to.
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Select
 Reply or ​​​​​​​ Reply All. -
Type your reply. You can add or remove recipients in the To, Cc, and Bcc fields. Select Options > Bcc to add the Bcc field.
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Select Send.