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It was my own Outlook that stopped auto-completing. I copied that nk2 file out of the mentioned directory and deleted everything else, opened Outlook, sent a test message and the address was saved when trying to send a following message. I then replaced the newly created nk2 file with the one I copied out, re-opened Outlook and it works like a charm.

Thank you to the person that posted his fix. Half the time people filed their answer and never bother posting back so thanks again.