I am currently working to setup a live@edu email solution for our school.
The plan is to continue to have our county.sch.uk email to arrive at school.
Our county have told us they are not able to send the 2 main accounts to any other domain.
We have registered this same domain name with LIve@Edu, this is done by placing a dns record to confirm ownership.
The option then is to allow this web space at live@edu to to pick up email from a proxy address.
We have created a sub domain - webmail.county.sch.uk
The email arrives at school, I then put a forward on this email (rm easymail) to webmail.c.s.u.
the user then can log onto Live@E, send emails from county.s.u and use all of their tools.
This allows me to put the forward on when it is convienient and work with each member of staff to explain and show, as and when I can.
When all staff are using the online solution or setup to recieve from the online option we can change our main MX record to forward straight to Live@E.
I don't think microsoft liked our county name as it took many weeks to have domains accepted, working with county to add dns records has also proved to be taking a while. ashamed to say I started this project in April and yet to finish.