I am wondering how to save a powerpoint file to my Blackberry Tour from an e-mail I sent from one of my e-mail accounts. I can view the file but don't know how to save the file so I can send it as an attachment to prospects later.

Do you have Docs to Go installed on your device? You should have an option to download attachment.

Wirelessly posted

Should be able to download it to your media card, just scroll down to the attachment in your email, hightlight hit the menu key and choose download.

As mentioned above make sure have docs to go, I'm not sure if you can download it from dataviz.com but if not you can install it via the desktop manager/after installing your BlackBerry os.