How can I forward all previously received bb.net emails?

I have a Bold 9930. I have unfortunately been using my sprint.blackberry.net email address for my business. Now that I want to change to an Android or iPhone I need to get hundreds of emails I need to save off my phone and forwarded to my new gmail account. I have set up the new gmail account on my phone for new emails going forward but I can't figure out how to get the old past emails forwarded. I found an app called Message X that sounds like it will do what I want but it doesn't work for my model. Sprint told me I'd have to forward every.single.email 1 at a time. :( I just can't believe that! Help?

Gotta love Sprint for all their help...lol
Seriously though, call Sprint and ask to be transferred to the Blackberry Tech Support Division and ask for help there...or call 877-255-2377, 877-644-8410, or 877-654-9111...