Brad Brooks has left his position as Microsoft's corporate vice president of consumer marketing for Windows to join Juniper Networks as vice president of worldwide enterprise marketing and solutions.
Brooks oversaw the launch of Windows 7, Microsoft's most successful operating system to date. He worked at Lucent and AT&T before joining Microsoft in 2002, and has worked as an intelligence analyst for the US government.
"Brad is a superb global marketer with a track record of driving significant business growth," said Lauren Flaherty, executive vice president and chief marketing officer at Juniper Networks.
"His depth of experience aligns very well with our focus on accelerating the new network, and I am thrilled we have Brad in this highly strategic role."
Juniper chief executive Kevin Johnson is the former head of Microsoft's Platforms and Services business, having left in 2008 following a similar Microsoft reorganisation.
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