Originally Posted by HashGordon
I think BB should offer this push email service ndependent of subscriber, or maybe a third party should.
That's a lot like expecting a car maker to insure that you can drive your car around without paved roads... Well, worse than that, actually.
The reason that Blackberries work as they do is because of the underlying infrastructure which consists of much more than just the GSM/GPRS/EDGE networks. The GSM/GPRS/EDGE networks are simply methods to enable access to RIM's infrastructure. Without the secure connection to RIM's network your Blackberry is a GSM phone with wired PDA sync to your PC. Not totally useless but you're not going to get email or internet-enabled features to work.
Microsoft's solution to push email might work in your situation but it's a ways down the road at the moment. Given their track record, they're going to need a lot of work after the initial release to get it working properly.