Thanks again. I did try to set up a new profile, but either I don't understand it or it is not possible now that I've deleted the Hotmail one. Tho' I have a .pst file (as well as the archive.pst), this is not 'seen' as .pst. This IanOutlookDataFile.pst is rejected as a .pst file.
I then attempted to repair my MS Office, hoping this would reset Outlook. It ran all night, but was really just hung up half-way through.
It boggles my mind how something that is so important can be so difficult to arrange. But that's computers.
Thanks for your offer to try on your old BB; but I suspect you may cause more problems for yourself, so best not.
Thanks again for all your efforts.