How to Set up “Mail Folders to Push” for e-mail (iPhone/iPad)
If you use folders to store e-mail, and you want to have instant access to e-mail stored in certain folders, you will want to take a look at your “Mail Folders to Push” settings. For example, if you use Outlook and you move an e-mail into a folder, if the folder is set to “Push”, the e-mail will show up in that folder on your iPad immediately. If you do not “Push” a folder, you will still be able to see the e-mail after you open the folder on your iPad and let the folder download.