I finally found out what it was. You have to open up a comm channel by pressing caps lock twice. You should switch it off right after your message though because every time I leave it on it kicks me off saying my ping is to high.
I've checked, reinstalled, and reconfigured the mike setting on my computer and the mike works on all the other programs except Arma II and OA. I've meet others who have the same problem so I know I'm not the only one. I should be able to just plug in my mike and use it and I haven't found any settings on the game that deal with the mike. What can I do?