Been waiting for outlook to give this option for a number of years now. The time wasted dragging attachments over and the time wasted from looking for attachments that are not attached due to coworkers not reattaching in an approval is aggravating.
The forward option isn't a great work around due to the original contacts not being included in the forwarded email, you have to re-enter them.
Please create a check box in the options that allows a reply message to contain attachments from the previous email. This is different from the check box that attaches the entire previous email which needs to be clicked open in order to view the previous attachments. This would be greatly appreciated by THOUSANDS, if not MILLIONS of Outlook users.