None Folders is an Exchange client for Android. It's got the same UI as the G-Mail client and works beautifully, with pretty much all of the same features as Touchdown, at half the price. It has a very pleasant UI.....unlike Touchdown which is clunky, antiquated and non-intuitive (sucks).
Nine Folders has one very cool feature - you can set the security to either"application level" or "device level", meaning that "application level" uses PIN / PASSWORD ONLY when accessing the app, not the device. As well, in this mode, a wipe from the exchange server would only wipe the app data, not the device.
Good thing you're not using VPN, because on Android, using VPN disables all but PIN and PASSWORD security, and forces you to use one or the other.