For the majority of Android users who need email access beyond their Gmail account, Android's built-in mail client performs adequately. It handles POP, IMAP and Exchange accounts without fuss, or any bells and whistles. But if you're someone who relies on email for your profession (and these days, who doesn't?) you've probably found yourself looking for a few more features, like a search function for Exchange accounts. If that's you, check out Enhanced Email from developer Quantum Apps.