Samsung Captivate :: Can't Open PPT Xls-doc Files In Gmail App

I have a samsung captivate. I am using the gmail app for 2 accounts, one work google apps account with its own customized url and one personal with a gmail extension. I have downloaded officesuite, quickoffice and thinkfree apps that supposedly help open office files. no luck. I have opened pdfs.I get lots of xls and ppt a day which i have to view. In the gmail app inbox view, all that happens is i can click the preview button for the attachment at the bottom of the email. there is no download button. When i get the preview button pressed, it gives me the circle of death spinning round and round saying "fetching attachment" and nothing happens, i hit the home key to end the fiasco.in my personal account it is working. In the google apps act, the wheel of death.