How do I transfer emails from one Outlook account to another?

Hello,
Outlook without Office 365: Export Outlook items to a .pst file
At the top of your Outlook ribbon, choose File. ...
Choose Open & Export > Import/Export.
Choose Export to a file.
Click Outlook Data File (.pst), and then click Next.
Select the name of the email account to export, as shown in the picture below.
Thank You.
sbcglobal email
sbc global
att net email login