Since Good Messaging for SBS 2003 is going to be EOL'ed in April, I wanted to know

1) If we move Good for SBS off the SBS 2003 server and install Good Enterprise on another server can we still use Exchange from the SBS 2003 server in conjunction with Good Enterprise?

2) Is there any work around for DST running on Good for SBS 4.9.1 ?

I would really appreciate a response. Thanks.