LogicMail is a J2ME E-Mail client supporting IMAP and POP, and designed to run on RIM BlackBerry handheld devices. Its goal is to provide an alternative to the service-oriented "push" E-Mail system that the device normally provides, so we can also use our conventional E-Mail services. The inspiration for this project came from the now defunct Mail4ME project, as well as some of the initial protocol code.
The big focus in this client is on usable IMAP support, which seems to be an afterthought in some other clients. Why IMAP first? Well, two reasons: First, I use IMAP personally. Second, the IMAP protocol allows a lot of optimization for constrained latency and bandwidth that POP does not provide. As such, I suspect the IMAP implementation will always feel much faster than the POP one. However, be assured that I have implemented POP support too, since I know it is important to a lot of potential users.