You can change the default signature that automatically appends to every email you send. You can also update an existing email signature. Here's how:
Change the default signature for all outgoing messages
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On the Outlook menu, click Preferences.
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Under Email, click Signatures.
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Under Choose default signature, select the account you want to use as your default signature for new messages and replies and forwards.
Update an existing email signature
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On the Outlook menu, click Preferences.
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Under Email, click Signatures.
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Under Signature name, click the signature you want to change.
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Under Signature in the right pane, update your signature.