Microsoft is set to receive 3% of publicis, razorfish is the fourth advertising firm in the world.
Razorfish bought aQuantive, the parent firm of three digital marketing firms in 2007.
"The acquisition of Razorfish is another step forward in realizing our strategic vision of building a world leader in digital communications, a critically important space for our clients," said Maurice Levy, chief executive of Publicis Groupe.
Razorfish clients includes: Ford, McDonald's and Best Buy.
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