I found the pst file at C:\Users\samst\AppData\Local\Microsoft\Outlook
That is the location used by older versions of outlook. if you added the account in outlook 2010 or above, it's in the path under outlook files. Not that it matters, if you moved the correct pst from the older computer, its wherever you copied it to.
But... if you are using imap, the problem isn't with the pst as outlook will create a fresh new imap pst and sync with the server, it won't reuse an old pst you moved.
I'm getting Log onto incoming mail server (IMAP): The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider.
Send test e-mail message: Your e-mail server rejected your logon. Verify your user name and password for this account in Account Settings.
This message indicates there is a problem with the log on. If you enabled two-factor authentication on the mail server, you need to use the app password, not your real password. If it's a gmail account, you need to enable "less secure clients" in settings. (It's not really less secure, but the older oAuth that doesn't support two factor passwords.)