Microsoft announced last month that advertisers can now extend their campaigns to social media through Windows Live for mobile in France, Spain, the U.K. and the U.S. by creating banner ads that will be visible across Windows Live Messenger and Windows Live Hotmail.

This builds upon Microsoft’s initial launch of mobile advertising for MSN Mobile in France, Spain, the U.K. and the U.S. where mobile ads are available alongside premium MSN Mobile content. Advertising on Windows Live for mobile is already available in Spain, and later this month will be available in Germany, Italy and the Netherlands, further extending its availability for advertisers. All ads placed on these two popular services will adhere to Mobile Marketing Association (MMA) guidelines.

“The mobile device is emerging as a prime opportunity for advertisers to reach their audience,” said Brian Arbogast, corporate vice president of Mobile Services at Microsoft. “This announcement is evidence of our commitment to providing advertisers with further opportunities to connect and engage consumers throughout their ‘digital day’ – at home, at work and on the go across multiple platforms, devices and geographic regions.”

Microsoft also announced plans to further expand its mobile offerings for advertisers to now include mobile search advertisements on Live Search Mobile. For the first time invited advertisers can create keyword campaigns through Microsoft adCenter that target customers on the go while they are using Live Search Mobile.

This will be the first time that Microsoft has enabled advertisers to monetize its popular mobile search service. The beta is currently available in the U.S. and will be expanded in the second half of 2008.