Emma Hughes the Inquirer , Thursday 24 July 2008. 12:13:00 Johnson jumps at chance to join Juniper MICROSOFT'S Vole-in-charge of its online and Windows businesses, Kevin Johnson is leaving the company to become chief executive at telecoms equipment maker, Juniper Networks. The move has come at a worrying time for our old friend Microsoft, as it faces unprecedented challenges in its Windows business and still hasn't managed... ...