don't have Docs to Go on the 9900! where do you buy the premium version from ? it is not in the BB World store !! just downloaded the Desktop Software and will go through it in details ! thanks once again !
Load the version that is bundled with OS first. See if it opens pdf files.
Newer versions (and the premium version if there is one) will be in BlackBerry World.
As I say, there may not be a premium version anymore for that OS. As I think about it, I think I bought it when I had OS5, but with OS7 the pdf reader was included.