New Outlook Online - Forgotten Attachment Reminder gone

Hi

One of our users used the "Have you forgotten to add an attachment" reminder, they are now using the new version of outlook and the feature is no longer there.

Does anybody know how to turn it back on?  or whether it is a feature that will be rolled out?

I looked on the Office 365 roadmap and there is a suggested attachments feature, Is that going to be the replacement?

Cheers for any info

Jason