I want Apple Mail to automatically move all email, read and unread, to the Archive folder IF it's past a certain date. I want this move to take effect on ALL my devices (mac,iPad,iPhone,etc). How can I set this up? Can I set this up from the iPad or only on the Mac?
"I have a me.com email address." queued me in that you are probably on IMAP. Simply put IMAP syncs your mail across all your devices, instead of having to delete a particular email three different places.
So, to do what you desire, you will have to create a rule on your Mac: