Select File > Open & Export > Open Outlook Data File.
Note: Depending on how Outlook is set up, it's likely the folder where the .pst file is stored will open automatically. If it doesn't, browse to the file's location.
Select the Outlook Data File (.pst), and then select Open.
Once you open the Outlook Data File (.pst), the file will appear in your folder pane. Usually you'll find it at the bottom of the list of folders. The following image is an example. The name of your Outlook Data File (.pst) will likely not be outlook data file. Usually, the name is based on the account the file is associated with. For example, an Outlook Data File for the account john.lee@dahuatech.com will likely be named John Lee.
You can remove an Outlook data file from the Folder pane by closing the file. This does not, however, remove the file from your computer.
In the Folder pane, right-click the name of the Outlook Data File, and then choose Close "Outlook Data File".