With the coming new Exchange version, Exchange 2013 – which will be also available in the next major update for Office 365, Microsoft has introduced a new reminder for email.
This new feature is called Attachment Reminder; it will remind you that your are missing attachment based on the text you wrote on your email.
This is pretty helpful, how many time do you forget the attachment? Now, with Exchange 2013, you will never forget anymore an attachment.
The reminder will appear when you will hit the Send button.
The only thing this feature is not solving is if you attached the WRONG attachment
Attachment Reminder is available with both Outlook 2013 client and OWA 2013.
You can watch the demo here http://youtu.be/u-2OEk2uzU0
On OWA, it looks like:
On Outlook client, it looks like: