by Gary Marsh.
Thank you everyone for the feedback. I too was unable to find specifics on 1.9→2.2 and I was suspicious that there might be 'issues' with the conversion.
Instinctively, I think that I will take Howard's suggestion and start from scratch, to be safe.
One unanswered question: Are there any known issues with migrating the Moodle 2.2.2 Windows version to a server based Moodle version that I should prepare for?