I already have Outlook on my main work laptop but also have a netbook for portability which I sync with my main laptop. I didn't want to pay for Outlook again so tried PST viewer as I wanted an application that would allow me to access my outlook data if I was out and about. I give it a good because it is free and does let you see all your mail in original folders, your contacts [but not sure if they can sort alphabetically] and calendar. The ability to search/filter your mail etc isn't great but will do me very well for my needs