I know this is my own software, but what kind of a person would I be if I didn’t mention it here?
I’ve released OfflineIMAP 4.0 today. OfflineIMAP is a program that connects to any standard IMAP mail server and lets you take your mail with you, anywhere (even if you have no net connection), on any number of computers, and read it with virtually any standard mail reader (even if it doesn’t support IMAP). All the while, it keeps all this mail floating around in sync.
I use it a lot, even with mail readers that do support IMAP (because OfflineIMAP is faster and more flexible.) You should too.