currently I have domain 132.com up and running perfectly which can be assessed at https://exchange.123.com/exchange for OWA. And so for OMA, etc.

I want to add on another companies domain such as 456.com which I can have users access https://exchange.456.com/exchange and so on for OMA etc.

Also, when creating there user profiles I do not want to have alies mail boxes if I don’t have to. Such as having mike@123.com and mike @456.com.

I believe that in my original post the link to the MSexcchange tutorial does what I want. However, I just cant figure out the steps and processes.

Now then, which process should I follow and will it work for what I want.

Additionally, to clarify anything I will have the MX records for both 123.com and 456.com pointing to the main servers ip address for 123.com.