I have a HTC Hero, purchased on 06/17/10. In the last day or so, I have been getting a Notification alert reading: "Low on space. Phone space is getting low." When I tap on the message it opens "Manage applications". When I sort these by size, it appears that the culprit is Mail, at a whopping 115MB. Yet I have emptied all the mail folders, including Trash, and I don't know where else to look. I have not installed many or any extraordinarily large apps. I called Sprint "customer service" about this, but they told me the only solution is to do a factory (hard) reset. For obvious reasons, I would prefer to avoid this dire step (and thereby inconvenience myself for something which is clearly Sprint's and/or HTC's issue), and so I am hoping someone might be able to come up with a more reasonable solution.