Very curious. Are calender and/or task updates registered and pushed out to the BBs? How about if a calender update is made on the BB -- does it get updated in Exchange? Can the BBs send mail, but just not receive? If any of the BBs have BIS email set up, can they send/receive emails under those accounts?
Sorry if all I am doing is asking questions as opposed to giving answers, but this might help identify the source of the problem.
Also, consider asking this in the BES Administrators forum. Perhaps a mod can move it.
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