I have followed the procedure described in "Move an Outlook data file from one computer to another" in Outlook Help, to import my .pst files from my old pc. I can see both the imported folders and the ones that Outlook created when I first installed it, and my incoming email is going to the right inbox. However, I am unable to remove the folders that I no longer need (the "remove" is greyed out when I right click on that folder).
Also, I now have two "contacts" lists (one empty) and it is the empty one which shows in the address book. Not sure how to fix this.