I recently changed from Office 2003 to 2010. I have thousands of Excel files in the 2003 format. When I open them now I’m saving them to the 2010 format, then I delete the old file. This is time consuming, and I’m wondering if there’s a way to convert all files at once. My Office 2010 is on a new computer, so I did a clean install, not an upgrade. I’m still using my old computer with Office 2003, and I’d prefer not to upgrade that one to Office 2010.