Does anyone know if it is possible to create an app that would allow the iphone to receive email from the company that a person works for through the company Blackberry server?

I work for a company with 50,000 employees that use Blackberry's to get there email all day long. I dont want to use a blackberry when i have my nice iPhone. The only way I can get my email is if I use the Cisco VPN connection on the iPhone to gain access to our email server. My company is very tight on security and wont open up the firewall for iphone users and even has our Web Outlook behind a VPN. I wish there was an app that was able to grab email from the NOC and displayed it on the iPhone.