Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Earle,
Exactly what are you doing that brings up that cautionary notice? Please give me it step-by-step as nothing in para 1.8 should lead to that happening.
Are you [as expected, para 1.8] opening the Outlook application then using it to open the outlook.pst data file or are you trying to open the outlook.pst directly from Windows explorer?
Additional - It seems to me that you are trying to double-click on the file outlook.pst. You should never do this. Open the application using the same shortcut you have always used - it could be in your Start menu and / or your TaskBar.