SQL Server 2000 + 2005 Working On Same Windows 2003 Server As Seperate Instances

Hi all,

I just asked some people to help me out and phone microsoft with the
following information, kindly they refused unless we setup a support
contract with them first, for pre-sales information. (That really does
not sound like good business sense to me - anyway here is our problem,
if anyone could help thanks).

"To tell and ask microsoft:

We will be setting up a microsoft sql server 2000 instance running on a
windows 2003 server.

1) We need to check this can run alongside a microsoft 2003 sql server
(either workgroup or standard edition), on the same machine. Are there
any .dll clashes if we do this? If there are can we run SQL Server
2000, in a virtual machine running windows 2000 professional. (I have a
licenced copy we can use for this).

2) If we run one instance of 2000, and one of 2003 of the sql servers,
can one use the processor licence model, and one use the CAL licence
model."

Thanks for any help, and any idea why they actually force you to use
news groups for pre-sales information?

David