I tried the directions in the link you sent. I excluded certain exchange files. I still can't backup pst files, but I'm willing to let that go by modifying the registry so it won't trigger an error.
But I still get errors, randomly, about AOFO and cannot for the life of me get this piece of software to backup without errors. Is there a way to exclude certain sections (like the Information Store, or Exchange, etc) from AOFO but still back them up with agents. Right now I have to create different selection lists, then create different jobs. This gets very hard to manage with my (albeit ineffecient) backup to removable hard drive strategy. If I'm missing something please let me know. I just want to be able to tell the thing, backup everything you can, even if its open, but don't tell me errors occurred if you successfully backed the same information up another way!