When I press 'c' to compose from the message window, I have the choice of sending from any of my email accounts or my "Desktop". Does the desktop option mean it's going to send an SMS/MMS message? It looks more like an email, but I'm thinking it's a text message.
Are you connected to BES? For me it's my Outlook email for work.
If not, your Outlook, it may be your att.blackberry.net email.
Not BES...just BIS. I don't think it's my att.blackberry.net email, but I guess it could be. I just checked again, and the "Send using" options were:
"Default",
My att.blackberry email, and
"Desktop".
(Note: I forwarded my POP3 and gmail accounts to my BB email account).
So I rechecked my Default just to be sure, and it shows: Messaging (CMIME) --> "Desktop" (without the arrow). I suspect that means default is text messaging?