If you need to change or just locate where Outlook stores its information:
"With Outlook closed, open Control Panel and double-click Mail. (Type Mail in the Search box.)
In the Mail Setup dialog box, click Data Files and then click Open Folder. This opens Windows Explorer using the folder where your Outlook Personal Stores (PST) file is located. The default name is Outlook.pst. Back up that file, which contains all your messages, rules, contacts, and appointments."