Zoom (NASDAQ: ZM) and Microsoft (NASDAQ: MSFT) were both well-insulated from the pandemic. Meanwhile, a growing list of competitors -- including Microsoft Teams, Alphabet's Google Meet, Facebook's Messenger Rooms, and Cisco's Webex -- are all trying to pull users away from Zoom. Moreover, inflation fears, rising bond yields, and a focus on post-pandemic plays have sparked a rotation from growth to value stocks over the past several months.