Can someone use *.pst files with Outlook Web Access? Microsoft Outlook downloads downloads new messages from the server and stores them on a *.pdf file on your computer. On the other hand, Outlook Web Access looks and acts almost exactly like regular Outlook but the program is not saved locally on the hard drive. Instead, it is completely web based and stores email messages online. I want to use Outlook Web Access but to save emails on a local computer. Thanks guys.