Moving Exchange data to a new server

Do you plan on replacing the current 5.5 server with the new system? Or is it to be completely different server with a different server name? If you are replacing the server you can create the new server with the same server name (simply fully install the server without joining the domain). Note though that the new system should mirror the current system. Once the install is complete you can backup the Exchange data, remove the old system from the network and restore it to the new system once you join it to the network.
If you are adding the new system you can simply join it to the Exchange site and configure it as a replecation partner.

You can do this several ways.

1. Upgrade your existing server to Windows 2000, over the top. This does work.

2. Install a new server in the same site as you existing server and then use the move mailbox feature in Exchange.

3. You can also use the Move Server tool that comes with Exchange.