Exchange 2000 - 2003 Migration Step by Step plan

I have written abit of a plan for an Exchange 2000 - 2003 migration I will be performing in a couple of months time, its step by step, and was wondering if someone Exchange guru out there could have a look and see if im on the right path ? - Would be appreciated. My word document has screen grabs of the current settings which need to be migrated over.

Thanks
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Considerations:
Will need to Export DHCP service to new Exchange Server
Both WINS and DNS databases will need to be transferred to the new server
It would be best to communicate with the Southampton office and ask them to delete any unneeded items in their mailboxes and clear out their deleted items, also stop everyone from accessing OWA in Southampton..
IP address of Exchange 2003 server will be different to the old one, so Firewall will have to be amended by Firewall company.



Step by step Plan:

Early April in Birmingham:
Purchase server and set up, install Windows 2003 and all the latest hotfixes, also make sure sohpos for portable is installed as a temp measure.

Deliver server to office.

Southampton:

After server plugged into the network, prep the schema for Windows 2003 by running the below from the 2003 R2 DIR on the OS CD:

adprep /forestprep

adprep /domainprep

Promote server using DCPROMO

Prep the schema for Exchange by running the below:

From the Exchange CD run setup /forestprep on the server that holds the and setup /domainprep


Once the above has completed:

Run the setup.exe from the Exchange 2003 CD and deploy the first Exchange 2003 server in the domain.

Select the option to upgrade a current Exchange 2000 installation.

Once Exchange setup is completed and the new server is a part of the companyname.co.uk domain and appears in all Exchange servers MMC’s:

Install SP1 and SP2.

Now its ok to uninstall Sophos for portable and install the network variation

At this point both Exchange servers should be operating in the same domain and be viewable on all Exchange servers.

Migrate the above settings across from the old server to the new server.

Set up connections from new server to Birmingham and make sure it coexists in the same routing group as the old server.

Configure new server as Bridgehead server making sure the server is the one which routes email through.

Make sure no mailboxes are in use on the Southampton server and make sure no incoming mail can get through by disabling the SMTP service, then perform the migration:

Right click mailboxes and select Exchange tasks…, in the window which opens select the move mailbox option.
 
Select a time for mailboxes to migrate and then kick it off.

Got to the pub

Once the mailboxes have migrated successfully, all email should route through to the required mailbox automatically on the new server.

Switch off SMTP on the old server and test sending a mail to a Southampton address from external account (e.g. hotmail). Should it work then email routing is working ok.

Public Folders:
To transfer the public folders to the new server, set up the new server as a replication partner of the old exchange server…
 
Now under Public Folder instances right click on the each public folder instance you need replicating to the new server and in the public folder box Add the new server into the “Replicate content to these public stores”

 

After each public folder has been set up for replication and all the public folder instances display under the new server, and obviously been tested remove the old server from the list of each public folder instance and dismount the public folder store on the new server.