migrate all the e-mail services from exchange 2003 to 2010

Hi All,

We recently migrate all the e-mail services from exchange 2003 to 2010. All the services running pretty well for months and we now decide to remove the old exchange 2003 servers. I’ve read some of the doc from Microsoft such as:

http://technet.microsoft.com/en-us/library/gg576862(v=exchg.141).aspx

http://technet.microsoft.com/en-us/library/bb125110(v=EXCHG.65).aspx

But I still got some confusing about it.

We have a root domain and its child domain. We deployed exchange 2003 in both domains and the exchange servers are configured in front end/back end in multi sites.

My question are:

1. Is there any recommended order to remove exchange 2003 server such as for example: remove back end first, then front end?
2. When remove an exchange 2003 server which currently holding RUS, can I move it to a front end server or it has to be held by the back end server?
3. When the uninstallation task comes to the final exchange 2003 server, how can I deal with the administrative group?

Any advices are welcome.

Exchange Lync Sharepoint