Originally Posted by mdorison
2. Is there a way to just force the Send Using default to be my @mycingular.blackberry.com address?
Yes, to #2, but that is not the best option as you don't want everyone in the world to know you blackberry address, if it starts getting spammed, etc., not much you can do. And people/clients will start emailing you at the BB address and it will not show in your mail on your desktop PC. You really need to get the BES configured properly for your corporate email.
BUT, to answer your question, go to Options, Advanced Options, Message Services, and highlight one of the services. Scroll the trackwheel to highlight the one you want to be the default, and save.
Now, you are going to have ongoing problems, if someone emails you at your corporate email address, and you reply, it will automatically reply FROM that corporate email address. You can not change that in a REPLY email.