It's likely that if you've been using Outlook to archive your emails, by the time you get to the point where you're ready to use a dedicated email archiving product such as MailStore, you'll have a number of PST archive files knocking about, and quite possibly in a variety of locations.
There are a long list of reasons why we recommend against archiving to PST (which you can read all about in
another post), but in this article I'm going to focus on what to do if you have gone down that route, and show you how to upload and centralise multiple PST archives in one go rather than one at a time.