Thanks for your efforts, Karl, and sorry for not being more clear.
Yes, your first summary point is correct.
The second point was correct, but not anymore, as I'm able to open the new profile and access my mails in that account now, after I deleted and set up the profile again.
So, now the issue is with the profile that I use to view the mails in my PST file. When I open Outlook and choose that profile, it will show the folder list for a second but then freeze.
OK, I see your point about the provider. In my case, it's a research institute in Taiwan (where I used to work), so I can't even read most of their info (as it's in Chinese), although I could search for some info in English, but I guess that it may not
be critical anymore at this point, as I'm able to access the account now (after I reestablished that profile).
As for your last comment, don't I need two profiles if I have two e-mail providers (i.e., the active account and the PST file)?