I'm looking into getting some CMBN battles going with some people in my Band of Brothers club again after a long hiatus from CM. I currently, just own the basic CMBN v1, and I'm pretty confused by all the different options currently available to me (not to mention wariness of the hefty price tag of getting them all). At the very least, I plan to pay the $10 uprgrade fee for version 2 of CMBN.
My main question is this: Will I be able to play some sort of PBEM game with someone that has all of the different modules installed (CMBN basic, Common Wealth, and Market Garden) on their computer or does my opponent need to have a downgraded, separate installation that matches mine exactly?
With regards to the Market Garden module, does this rely upon the installation of the Common Wealth module? Market Garden has a lot of Common Wealth forces in it, right? If I do buy Market Garden but not the Common Wealth forces module, does this mean that I can only play with American and German forces when using Market Garden?