Hi ValpoMan - welcome to BBF.
The answer is YES! You can get your corporate (Exchange) e-mail, even without a BES. Included with the BlackBerry software is a program called the BlackBerry Redirector. The redirector runs on a PC, logged in to your network (at work). It must remain logged in 24X7, with the redirector running. If the PC dies or gets shut off, no redirection.
So... If you have a PC you can leave on the office network 24X7, you can run the Desktop Redirector program and push your e-mail wirelessly.