OD master in AD integration plan – AFP ?

Hello

With reference to the excellent guide AD/OD Integration here by Joel Rennich and Aaron Rosenblum, I have a request for further info. about the following statement

If you are only using the OD system to supply management information and have no intention of running file services from this machine, which is the preferred situation…

I have an xserve which is acting as our current OD master for OS X accounts, storing network homes with AFP service running. We are planning to integrate fully with our AD service this summer, and I figured I could use the existing OD master xserve as the OD server in the setup (see guide) and set up a new xserve and xraid for AD binding/home storage as in the guide. My problem is what to do with the current OS X accounts and data.

How will I manage the existing students OS X accounts (for the time it takes them to transfer their data to the new accounts in the AD/OD set up) if it is not desirable to run AFP on the OD server as stated in the guide ?

Thanks