My employee calls in sick after negative feedback

A reader asks:

Two years ago, I began managing Craig, who had been doing the same tasks day in and day out for a decade. He hadn’t adapted to new technology, best practices, or industry trends. My first order of business was to coach him and challenge him to grow and learn. For more than a year, we built up a great trajectory. People saw how much his work improved and commented on it frequently, and said he seemed revitalized in many ways. His progress gave me a lot of hope that he could...