Cannot remove needless PST


Outlook version
Outlook 2010 32 bit
Email Account

I had to uninstall Outlook 365 (for financial reasons) and reinstall Outlook 2010, and somehow I have ended up with two PST files.

My account is an IMAP one.

The top one in the list (C:\Users\USERNAME\Documents\Outlook Files\Outlook.pst) is inactive, but it is the default PST.

The second one (C:\Users\USERNAME\AppData\Local\Microsoft\Outlook\ is where all my active files live and breathe.

I cannot change the default from the inactive PST to the active PST (the option is greyed out) and I cannot delete the default PST.

I wish to stick with Outlook 2010 if possible, but the inactive PST is irritating.

Any clue as to how I can resolve this?