PST stands for “Personal STore” – as in your personal mail storage. PST files are actually fairly complex databases that contain your mail, your calendar, your contacts, and even more when you use Microsoft Office’s Outlook mail program. (Not to be confused with Outlook.com, the online mail service from Microsoft, which is completely unrelated.)
The default location has changed a time or two over the years. Of course, there’s always a chance that your PST is stored in some other, non-default location.
Rather than telling you where the default location is, let’s use Outlook itself to tell you the exact path of your PST file and then use Windows itself to do the same.
I’m using Outlook 2013, but the technique is similar for older versions.
The easiest and quickest way that I know of is to open the “tree view” of your folders, if you haven’t already. The default view is often something similar to this:
Underneath the File menu is a rightward pointing arrow (>). Click that to expose the full-folder pane:
Each top level item represents a separate PST. In the example above, *****@yahoo.com is a Yahoo! email account configured in Outlook 2013, and *****@gmail.com is a Google mail account which has been given its own PST file. In other versions of Outlook, you may see things called Personal Folders or Outlook Today. You may also see additional top-level entries for other email accounts or PST files that you have opened manually.
The key is that each top-level item represents a separate PST.
To find out about that PST, right-click on the top level item and then select Properties:
That will give you the Properties dialog for that specific PST file:
Now click the Advanced… button:
And there, right in the middle of everything, is the Filename and the full path to the PST. If it’s too long to display in the allotted space, you can click in the item and arrow back and forth to scroll the text right and left.
A PST is just a file, so using Windows own built-in search for files with the .pst extension is another approach to locating your PST.
In Windows 8, I simply started typing *.pst at the Start screen, which means any file that ends in .pst:
I realize that it’s a little difficult to see above, but underneath the search box that appeared as soon as I started typing, I click Files to limit the search result to files (as opposed to Apps or Settings). The result is that on the left, any PST files found are displayed.
Hover the mouse over (or tap-and-hold) on a result for more details:
And of course, those details include the file’s location.