Join your BES and I am betting your troubles disappear.
I am aware of no issues with any calendaring with either Exchange or Domino. If there are, they are likely at the BES level and are routinely fixed with maintenance releases.
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Z10 and PlayBook <- 9650<- 9630 <- 8330 <- 8130 <- 8830 <- 8703e <- 7130e <- 7250
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