If you want to remove an attachment from an email message you received from someone else or a message you sent, you can do so on a message-by-message basis. you can’t remove attachments from multiple messages at once.
remove attachments displayed in the email message header
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Open the email message in the reading pane, or double-click the message to open it in a new window.
select the dropdown arrow next to the attachment name and then select remove attachment. You can also select save to onedrive or save as first to transfer the attachment to onedrive or your computer, then select remove attachment. If the email message contains multiple attachments, select the first attachment, hold down the shift key on your keyboard, and then select the last attachment. select remove attachment to remove all selected attachments.
close the message and save the changes.
remove an attachment from the message body
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To remove an attachment that is displayed in the body of the message, double-click the message to open it in a new window.
from the move group on the ribbon, select actions> edit post.
click to select the attachment in the body of the message and then press the delete key on the keyboard.
close the message and save the changes.
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