InfoPath cannot open the following file: http://sharepoint/ChangeMgmt/Forms/abc.xml InfoPath cannot open the form. To fix the problem, contact your system administrator.
Form template: http://sharepoint/ChangeMgmt/Forms/solution.xsn. There is an error in the form’s cache. To correct the error, open the form again.

This was my solution is solving the problem. Before you start clean the Internet Explorer Cache!

For Windows Vista

• Locate C:\Users\%Username%\AppData\Local\Microsoft\InfoPath\FormCache2 and delete complete folder. If this fails than rename the subfolders to something else like abc and try again. I got a warning and the action failed if I did not rename the folder.
• Run C:\Program Files\Microsoft Office\Office12>INFOPATH.EXE /cache clearall

For Windows 2000/XP

• Locate C:\Documents and Settings\%Username%\Local Settings\Application Data\Microsoft\InfoPath\FormCache2 and delete the folder.
• C:\Program Files\Microsoft Office\Office12>INFOPATH.EXE /cache clearall

After these steps my Infopath forms opened again

Download SaveAsPDFandXPS.exe from here.

Run SaveAsPDFandXPS.exe and accept the Software Terms. Click Continue…

Click Office button; save as and choose PDF or XPS

That’s all and for free. If you put the SaveAsPDFandXPS.exe in the installation folder named “Updates” than it will automatically be installed as part of the installation routine. As far I remember Microsoft was not allowed to have this included by default and we as users are forced to first download the binaries from the internet.

The published calendar is based on the iCalendar exchange standard which is defined in RFC 2445. I love the Mircosoft’s integration and smooth registration on the internet. Check out my howto to configure this with your own Outlook 2007 calendar.