Tonight I had a customer informing me that since we installed the latest rollup for Exchange 2010 SP1 their BlackBerry were sending duplicate messages. After doing some research into the issue, I came across this blog http://blogs.technet.com/b/exchange/archive/2011/03/14/exchange-2010-sp1-rollup-3-and-blackberrys-sending-duplicate-messages.aspx
For the time being, hold off on installing RU3 until Microsoft get’s this fixed. In fact, they state that they have pulled the Rollup for now. I suggest looking at the EHLO link above to confirm when it is fixed.
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