Originally Posted by j72978
I don't know if this is just a limitation of Blackberry devices or if they blocked something at work, across the board.
It's not a limitation of the BlackBerry.
BIS with OWA 2007 is supported, but your Exchange administrator must configure OWA in a specific way to allow BIS access. It has nothing to do with ActiveSync.
Most likely, they are deliberately blocking it from being used. This is not uncommon.