The e-mail attachments take up much space on the mail server. If you have unlimited storage, it is not a problem, but otherwise, you may not receive external e-mails.
Outlook Attachment Remover is a plug-in for Outlook to remove an attachment from the host e-mail, to recover it so as to reduce the file size for storage. You can even keep images that are in the body of the email. A box called "Remove after saving" deletes the attachment of the e-mail after downloading. But you can replace it with a link to the file that contains the attachment.