So, I've tried everything. I even upgraded my Yahoo account to the Yahoo mail plus account for $20. I deleted my yahoo account on my iPhone and rebooted, and re-added it. It does in fact have the IMAP prefix and sure enough the Push works well. It sends, receives, etc. BUT, it doesn't show anything other than an inbox. When I first add it, it shows them once, but they quickly disappear and show just the inbox. What do I need to do to keep the rest of the folders there, not just the first time I setup the account?