1. There is only the one version of DM for Mac, as its relatavily new, and does not offer all the abilities of DM for PC.
2. No. You need a Blackberry data plan to setup email on a blackberry.
4. go to opera mobile site to have a look, though im not sure how you get in on the phone without a data plan. And yes, the BB has a browser, but without a blackberry data plan, you won't be able to use it.
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."