It's a complex form, so I don't want to upgrade it to the IP2010 format - which would be required to publish it as a sandboxed solution. So I didn't re-inject the form. Same IP2007 form, same qrules, same server name- just on SharePoint 2010 instead of SharePoint 2007.
If I open the form in the client, the submit works. But if I open it in the browser, I get the error: Failed to submit to SharePoint. URL = 'http://sharpointsite.com/sites/dept/portal/_vti_bin/lists.asmx'. The URL is valid- I can access it directly in the browser and also can use it to submit the form when it is opened in the client. To clarify, as long as it is an IP2007 browser form, I don't need to make any changes to qRules now that it is in SharePoint 2010, right?
The form was uploaded as an Administrator installed form prior to migraiting the content databases... I'm going to try having the form re-installed.