Importing the patient portal from 501 to 500 for customers who use the WMT interface

I have a few customers who are interested in OpenEMR501 but their support contract with WMT for the lab interfaces has not yet been tested on 501. We were advised by the WMT team that if we upgraded versions of 500 to 501, the support contract for WMT would be null and any support would start at $125/hour.

Has anyone tried and succeeded at importing the patient portal from 501 to 500? Has anyone gotten the WMT interface to work with 501?

Thanks!!!