Cleanest way to relocate User Profiles to seperate Raid drive with MAC OS X users RDP to W2K8R2

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http://serverfault.com – I have a company that WANTS to be windows but the Owner....loves his MAC so I now need to migrate all the C:/Users/? folders to the shared drive in a clean way. I have a few ideas of how to do it but was unsure if there was a best practice. The users keep saving important documents on their desktops and even with begging/pleading/arguing I can not seem to force this habit away so I need to move the users folders to a drive that is a RAID/Share for redundancy reasons. They all RDP into Windows Server 2008 R2 and access a Windows based software but save important documents in their personal (HowTos)