I know everyone has prob seen this too, maybe worth mentioning though
I can't post the link but if you google shudnow and exchange 2010 sp1 blackberry enterprise the link should be the first result. Discusses modifying the BESthrottling policy, however in the comments one guy had to apply the changes to his default throttling policy as well:
Get-ThrottlingPolicy | Set-ThrottlingPolicy -RCAPercentTimeInCAS:$null -RCAPercentTimeInMailboxRPC:$null -RCAMaxConcurrency:$null -RCAPercentTimeInAD:$null
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