* 1 Open Outlook. Select File > Import and Export > Export to a file > Next.

* 2 In the "Create a file of type" window, select "Personal Folder File (PST)," and click "Next."

* 3 The next window allows you to choose which folder you would like to export. If you would like to back up all your emails, simply select "Personal Folders" and make sure the box next to "Include subfolders" underneath the window is checked. This will export all folders in your mailbox.

* 4 The next window allows you to choose a save location for your backup. The default location, "...\AppData\Local\Microsoft\Outlook\backup.ps t" may be difficult to locate later. Clicking the "Browse" button allows you to choose another location, such as the Desktop or an external drive. Once you've chosen a name and location, click "Finish" and Outlook will create the file for you.