Huh, I've got staff here who put their Iphones and Droids on our Exchange system without having to buy anything.
The key word here is SYNCHRONIZE, not interface.
You can connect to your email, whether Outlook or Exchange, or even Gmail without any problem.
But, to synchronize means that if I input a new contact on my iPhone, it ‘magically’ appears on my PC about 15 minutes later. Attach a picture to a contact, same thing. Change phone numbers, add info, ect. It all updates across platforms. Hence, the work synchronize.