I designed a simple custom form in Outlook 2010 for our operators to fill out for phone messages.  Company policy requires that RMS be used for any email that contains personal information.  We have our own Exchange and RMS servers.  I can send the form back and forth with Rights Management enabled with no problem, but when I duplicate the form on my users' computers and they send the form with RMS enabled, the recipient gets the following error message:

"The custom form cannot be opened. Outlook will use an Outlook form instead. You cannot perform this action. Permission to this message is restricted."

I've tried installing the form identically on both PCs, clearing the form cache, renaming the FRMCACHE.dat file, and recreating the Outlook profile on both ends.  I see articles about problems with forms and problems with RMS, but I'm coming up blank for the combination, and I've run out of ideas of things to try.  Any ideas out there?

Thanks!