ChatterEmail is available from
http://www.palm.com/us/software/chatteremail/. The developer is no longer working on it, he is now a Palm employee. Support though is still available for it on his support site.
An IMAP stands for Internet Message Access Protocol. The advantages over POP are tremendous. IMAP clients (ChatterEmail is one) retrieves email and manipulates the message stored on the server, without having to retrieve the entire message. You can view headers or parts of or the entire message. You can delete, move them, change status, add storage boxes, bunches of other things.
When a message hits a mail server that supports IMAP/PUSH, and your device (desktop/laptop/hand held device) is logged in to the mail server, the message is pushed to the device - you do not poll with this setup - again, you are logged in to the server and just waiting for the mail to be delivered. When it gets delivered, ChatterEmail wakes up and tells you; otherwise, ChatterEmail sits there quietly doing its thing.
Now the Palm OS is not a truely multitasking animal. As a result, in most situations, one thing at a time is the routine. It can send mail/receive mail while you are doing something else, but it does not do it in true multitasking fashion.
What this means is that you will see an increase in response delays. When the device is trying to establish connection with the server or you are in an area with a weak data signal, et cetera, the device will be slow to respond at times.
The advantage - if you have a heavy email user such as myself, the mail is gotten and you can respond to it quickly.
ChatterEmail has a window popup on top of the application you are working in. When an email comes up, the window comes up and you can read, respond to or delete the message and after that action is done, you are returned to the application you were using.
Give it a go - it really is the email application for those on the go.
Ben