Infotrope Polymer is a fully roaming online IMAP
client. You can roam with your full configuration,
your addressbooks, and even your bookmarks. It's
fully ACAP enabled, and will operate with or
without a local disk cache, and over very narrow
connectivity (like GPRS), using minimal bandwidth.
It supports the majority of extensions to ESMTP,
IMAP, and ACAP, whether in RFC or I-D.