First of all RIM, doesn't recommend using BES accross sites. Depending on your bandwidth, the Tokyo folks complaint is probably right. Also, being on Exchange 5.5 and I'm sure what BES 2000 is. Do you mean BES 2.0? I would suggest getting to the latest BES version 4.0 and really getting exchange upgraded to 2003 as well but that is a big undertaking, I know.
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