I'm using 2010, this should be the same for 2007 as well. Go to start orb, then documents, you should see a folder named Outlook files. Open it and you see a file with your email address from your isp. Copy that to a thumb drive or sd card. Then after you reinstall windows and reinstall 2007, just follow same steps to get to outlook folder and then copy that saved file to that folder and wala...just like it was before you reinstalled. I find it easier than exporting and importing....but good to know as well.