I have a form that was saved in InfoPath 2003 compatibility mode because many of my users only have InfoPath 2003. Is is possible to publish this form to a SharePoint 2010 library where users can still open it in InfoPath 2003 and then submit it to the SharePoint 2010 library?
I don't believe there should be a problem with this.
Can you try it and let the community know if there were any issues? Thanks!