One Mail lost during My MIgration weekend.
It was a long 4 page email which did warrant a response - but my bad - I lost it in my migration. Now if the person (She wanted to be anonymous, I remember) would come up and try resending the email (allow me to introduce the sent-folder feature from Outlook :) ). then i promise a prompt and very direct reply :)
It was bad enough to lose an email, I just didnt want to compound that error by not admitting to it and giving the chance for the person to touchbase back.