Hey Julian,
Is the following correct?I can delete licenses on the free acct if they were used for testing but not if they were sold?
That's not correct. I'm not sure where you read that. The truth is that in the free accounts it's impossible to delete product keys. It's just a limitation we put into place.
If you're using a monthly account (or you update to one) then you can delete as many product keys as you want.
Eg I have a license I have sent for reviews which were never activated. Can I delete these? There is no email acct attached to this license.
You can't delete them in the free account because it's impossible. You can re-use them, though. Or you can upgrade to a paid account and delete them.