Was at a client site last week, the InfoPath 2007 forms needed to be browser enabled, so I performed the following steps:

1. Clicked on the Tools menu
2. Selected Form Options menu item
3. Selected the Compatability category
4. Checked Design a form template that can opened in a browser or InfoPath
5. Entered in the client’s site URL

Once I did this and ran the Design Checker by performing the following steps:

1. Click on the View menu
2. Select the Design Tasks menu item
3. In the task pane to the right, I selected the Design Checker
4. Click on the Refresh button

I received the following error message:

The SOAP message cannot be parsed.

After doing a quick Google search, you get the following knowledge base article:

KB 923521 Error message when you try to enter a server URL in InfoPath 2007: “An error occurred while verifying the form template”

Essentially what this knowledge base article is telling is, when providing a URL for the server, you need to provide the URL to the InfoPath Forms Services not to the SharePoint Web Application.   What is the URL for InfoPath Forms Services, for most standard installations it is http://SERVER-NAME/_vti_bin/FormsServices.asmx.  NOTE: Replace SERVER-NAME with the name of the server where SharePoint is installed.

Just a quick tip that I thought those beginning in SharePoint would find useful.