My Outlook 2007 uses a .ost file with Exchange. I recently set up new computer with Win7Pro 64 bit and find my Outlook is not finding some things. How do I reset the index? I did this once a long time ago, but need a refresher. Seems like you quit Outlook, go to control panels, index options and from there I am unsure. Seems like you open the advanced button and check and uncheck somethings..?