Microsoft said the deal gives it location and mapping technology that complement its existing offerings such as Virtual Earth, Live Search, Windows Live services.
"This acquisition will play a significant role in the future growth of our search business and presents a huge opportunity to expand our platform business beyond the U.K. and globally," said Sharon Baylay, general manager of the Online Services Group at Microsoft.
The move is Microsoft's latest in a series of purchases this year, namely its $6 billion buy of Aquantive, making it the company's largest acquisition to date.
"Partnering with Microsoft gives us a world of new opportunities to build our mapping services into new technologies and applications," Multimap CEO Jeff Kelisky said in a statement.
"As one of the world's foremost technology brands, Microsoft is in a position to bring even more value to the Multimap service and give people everywhere new, exciting and fun ways to get from point A to point B," Kelisky added.