Joe Belfiore, Microsoft head-product and co-manager-Office team, says he’s retiring, but “staying until summer to help” with transition … Online marketplaces operator Etsy promotes Rachana Kumar to chief technology officer, effective Jan. 1, to replace departing CTO Mike Fisher Dec. 31, who remains an adviser through April ... Maximus names Craig Shinn, ex-Verizon, vice president-digital government solutions ... Cybersecurity company PC Matic promotes Morgan Rubens to vice president-state, local and educational sales.