Export email sub-folders to from PST to MSG

I have several PST’s that need to be offloaded from a PST to MSG format in a folder. The code in the link below works a single folder/level correctly but I need it to enumerate folders beneath ‘Sent‘. What is the correct way to do this? NOTE: this is from a personal PC not as Admin or access to Exchange Server.

Question: Can Powershell get emails from a PST? (User KirtCarson) (https://community.spiceworks.com/topic/992429-can-powershell-get-emails-from-a-pst)