Outlook Web Mail and PST files

Looking for help accessing Outlook 365 PST files.  My employer controls my Office 365 app on my PC, and has decided they will be deleting all PST files effective immediately.  I have them all backed up to an external hard drive, but I am trying to find a solution that will allow me to access them outside of my employer's control.  They also don't allow me to "switch accounts" in the Outlook app on my PC.  Does anyone have any ideas or suggestions that might work.  I was hoping to be able to access them with a paid outlook 365 web mail account, but that doesn't seem like a viable option either.

Any ideas are appreciated.

Thanks.