I had the BB 8830 World Edition as my first BB device and was more than a little surprised to find it could not view XML attachments.
I now have a 9530 Storm and it STILL can't view a straight-forward, no-nonsense, 7bit ASCII XML file. What the heck is RIM playing at?
Or have I just missed a subtle option in a menu somewhere or need to download some ultra magic piece of software to view the attachment?