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In the email message in classic Outlook, select the attachment.
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On the ribbon, select the Attachments tab.
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Select
 Save As. - 
                          
Accept the attachment name or rename it, then select Save.
By default, the attachments are saved in your Documents folder, but you can choose a different location while you're saving.
 
Tip: To navigate to the saved file, select File Explorer (
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Select the down arrow to the right of the attachment title in Outlook for Mac.
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In the menu that appears, choose Save As.
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Accept the attachment name or rename it and select Save. You can also accept the default folder or choose a different location at the prompt.
 
Tip: You can also open or preview an attachment without saving it. For more info, see Open or preview attachments.
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Select the down arrow to the right of the attachment title in new Outlook.
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In the menu that appears, choose Save to OneDrive or Download.
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By default, the attachments are saved in your Documents folder, but you can choose a different location while you're saving. Note: The options on the menu can vary based on the type of attached file. You may see "Edit in PowerPoint desktop app" for a .pptx file, for example, or "View in OneDrive." If you don't see Save to OneDrive, either open it in the desktop app and save, or download it.