A solution was found and thanks impart to a person on T-Mo's forum for it. S/he deleted the secondary account or the one that cannot open the attachments and then created it again as such:
Settings -> Accounts & Sync -> Exchange ActiveSync -> follow the steps to add that email again. You might want to go into ActiveSync settings and make personal changes as I had to. (text, retrieval, time, etc)
WHALLAH! Not only do I see the attachments now but whatever form they are in, there is a icon (i.e. .pdf,, etc, etc)
I've opened the .pf and it asked me which viewer I wanted to use. I was so happy, I thought I'd come share. Hope it works for you too J240 and others having issues. Let us know.