Do any iOS Email Clients allow the folders to expand/collapse like Outlook? I have a 12+ gb exchange account, with hundreds of files &amp; sub files. 

The iOS mail client doesn't allow the folders to collapse &amp; expand, which makes searching for files a real PITA. 

Are there any mail clients that have the expand/collapse feature?
The best folder management app for email I have used is eMailGanizer Pro.


  Folders
  Expand/Collapse style folder navigation
  Find folders by searching
  Add, move, rename, &amp; delete folders
  Off-line operation for later synchronization
  Universal Inbox, Unread, &amp; other 'Smart' folders
  Show all folders/labels for email