Exchange email broken for CS accounts
The server reports that the user is not known when trying to send from the exchange server to a non-exchange email address even when using the web client.
It appears you can get a message from one exchange account to another if you are using
If you're desperate, you can send a message from your RCS account to an outside account if you use
but it won't go in the right sent folder, etc.
The problem has been reported and is being investigated by the VCC.
Working as of 2:54pm 9/25/2012