It would be great to be able to rename attachments when forwarding emails.
Sometimes you need to rename attachments and the only way is to sabe it to PC and then attach again.
Related to this, it would be extremely helpfull if there was a simple way to have all of the attachments file names put into a list or table. I often will have mult. attachments included on an email all covering/related to a single main topic and the efficiency lost typing out each of the attachment names, or saving them down, rename/copy, paste each back to the body of the email. A table or list could then be formatted as bullet point or numbered list perfect for quick descriptions of each file.
Simon Collis commented
This would be very useful even before sending emails. I often use a program that will generate an attachment for Outlook and it ends up being "Exported results yyyy-mm-dd_hh-mm-ss.(file)". It'd be really handy to be able to rename that inline, rather than having to save it, rename it, then reattach it.