I ordered a new server this weekend to replace my existing Windows Server 2003 infrastructure. This new server will run the same roles as my existing server, but will have twice as much RAM and will be "green." It will utilize the new AMD Athlon X2 BE-2400 Brisbane 2.3GHz 45W Dual-Core CPU, less cooling (due to the low wattage CPU), and a smaller power supply. Should be fun. I haven't built my own hardware since the 90's. :)
I'll be building it with x64 Windows Server 2008 Enterprise edition and utilize Hyper-V for my virtual DC and Exchange 2007 servers, instead of VMware. The host server will function as my Exchange 2007 Edge server and host the www.expta.com blog on IIS 7.
The plan is to bring up the the new W2K8 server, build new virtual DC and Exchange servers, move the mailboxes to the new Exchange server, install the Exchange Edge role, and move the blog to the new server. Once I know everything is working properly I'll decommission the old Windows 2003 and Exchange 2007 servers.
Hopefully, there will be very little downtime. I only expect brief outages as I update my router configuration. As usual I'll post my experiences with the upgrade, as will as any troubleshooting tips and gotchas I discover along the way.