RIM’s BlackBerry handhelds are known for their insane email capabilities – unfortunately, they stop short of syncing read/unread status to IMAP servers.
This limitation is highly annoying, as it partially defeats the purpose of IMAP…but could be lifted in the near future. BlackBerryLeaks have received a PDF detailing the new features of BIS 3.0. Among them is read/unread sync:

Our image comes from Engadget, who ask why there is no direct IMAP support. The answer for this is short and sweet: reliability. One of the reasons why RIMs devices are as reliable as they are is their ability to sync up with a server even in unreliable networks – once you are connected to the IMAP server directly, this advantage is gone…
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