In answer to your second question, yes, this should be possible. Basically what you'd need to do (test all this...
in a lab first) is:
- Set up the 40 users on your Exchange 2003 infrastructure.
- Configure Exchange 2003 to accept all e-mail inbound to YOURCOMPANY.COM.
- Configure Exchange 2003 to "send unresolved messages to a smart host," where the smart host is the external IP address of your hosting provider's SMTP gateway (i.e., the equivalent of where your public DNS Mail Exchanger [MX] record is pointing today)
- Redirect your public DNS MX record to point to your Exchange environment (i.e., whatever IP address[es] you have opened on your firewall for port 25 in order to route mail through to your Exchange 2003 environment).
One final note: Make sure that your reply-to addresses throughout both the new and "cheapy" environments are all set to YOURCOMPANY.COM. The "cheapy" environment should be set that way already, but the new environment you set up will need to be configured this way as well, obviously.
Hope that helps!
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