It's possible that you've spoken to people who just can't verbalize it correctly, but if you read the terms of service, you'll see that "Microsoft Direct Push" requires an enterprise plan. If you are syncing with Exchange, that's what you need.
If they do have documentation that says that corporate email is "any email behind a firewall", I would be seriously surprised. I don't know of ANY email service that's NOT behind a firewall.
Jim
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