So far I've tried the default mail app on my Motorola Xoom 3.2, Touchdown, K9, Enhanced Email and Maildroid. They all work with Exchange and Imap but none are able to keep my many folders in hierarchical order as in my Outlook 2010 account. I have also been unable to get any of them to search for emails. Additionally, filtering and sorting would be nice. Essentially, an Outlook client for Android. Have I missed an option out there in the Market that can do what I need?