 CAMPBELL, Calif.--BUSINESS WIRE--8x8, Inc. NYSE: EGHT, a leading integrated cloud communications platform provider, today appointed Dave Sipes as Chief Executive Officer and member of the board of directors. The company also reaffirmed guidance for the third quarter and full-year fiscal 2021. Sipes was most recently COO of RingCentral, where he led go-to-market, product, and engineering and was instrumental in the 12-year growth trajectory of the company from 10M to over 1B in revenue. Fo 