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To attach a file(s) to a message you are sending, in the composing window, on the Message tab in Outlook, click the paperclip icon marked Attach [file]. Navigate to where the file you want to send is located, select the file, then click Insert in Outlook or Choose File in Apple Mail. Messages cannot be sent if they are larger than 35 MB.
To view an attachment that was sent to you via email, open the email message, then right-click in Outlook 2013 or 2016 (Windows) or Ctrl + click in Outlook 2011 or 2016 (Mac) on the file name. From the menu that appears, select Open.
To save an attachment that was sent to you on your computer, open the email message, then right-click in Outlook 2010, 2013 or 2016 (Windows) or Ctrl + click in Outlook 2011 or 2016 (Mac) on the file name, then click Save As from the menu that appears. Navigate to where you want the file saved, then click OK. In Apple Mail, click the Save button. If there are multiple enclosures, you may save all or just individual enclosures from a pull down menu.
To remove an attachment from an email message, open the message, then right-click in Outlook 2013 or 2016 or Ctrl + click in Outlook 2011 or 2016 on the file name, then click Remove from the menu that appears. In Apple Mail, with the message open, from the Message menu, select Remove Attachments.
Important: Because attachments can contain viruses, you should be very careful about opening them. When in doubt, contact the sender and verify they sent the attachment.