OS X :: Migrating Mobile User Accounts From One Domain To Another

I'm looking after some Macs that are migrating over to a new domain. The users are out of the office a lot, so they use mobile accounts on Macbook Pros using the most recent version of Snow Leopard. A lot of their configuration is specific to their mobile user accounts and I obviously can't log into the new domain using a mobile account from the old domain (I tested). So I found this: [URL] It outlines what I need to do in order to delete the local cached account without deleting the home directory. It also outlines how to give the same user account on the new domain access to the same home directory on the Macbook that they were using before.

- Unbound from old domain
- Bound to new domain
- Logged on as root and opened terminal and ran the below commands:
dscl . list /users (to find the user account)
dscl . -delete /users/USERNAME (this deleted the locally cached account)
chown -R USERNAME:NewDomainName.localOUThatUserIsIn /users/USERNAME

When I run the last command, I get the following chown: NewDomainName.localOUThatUserIsIn: Invalid argument (it doesn't display the after local) I verified that I was using the correct OU. I added NewDomainName.local to the DNS tab in Network settings under the domains to search in.