msyhooMicrosoft’s search advertising group says it’s starting to wring more revenue out of the Internet search ads that it’s serving as part of its partnership with Yahoo — despite recently needing to extend, for another year, its commitment to cover revenue shortfalls experienced by Yahoo under the arrangement.

The news follows a report by the Wall Street Journal last week saying that Yahoo has been “quietly” trying to find a way out of the Microsoft search deal, without any luck so far. The report said that Yahoo CEO Marissa Mayer, the former Google exec, has been seeking to end the pact since she joined Yahoo last year.

In a post this morning on the Microsoft Advertising blog, general manager David Pann says the search advertising group has seen a 25 percent increase in click volume since last year, meaning that more people who conduct searches are clicking on the related ads. Under its partnership with Yahoo, Microsoft serves up the underlying search technology and related ads for both companies.

The key metric is revenue per search, an indicator of the effectiveness of the ads in attracting the attention of web searchers after they enter a keyword. Pann says the company is seeing “double-digit improvements” in revenue per thousand searches.

Pann writes, “As you may have read, Microsoft recently extended a revenue guarantee arrangement with Yahoo! – which will further stabilize our partnership and instill confidence in the continued success and growth of the Yahoo! Bing Network. From the beginning, we have remained committed to providing advertisers a viable alternative to Google in the search market.”

Microsoft’s Online Services Division, which includes the Bing search engine, improved its financial results in the March quarter with a $262 million net loss, compared with $480 million in the same quarter the previous year. Revenue in the division was up 18 percent to $832 million.

RELATEDSearch stats: Google slips, Microsoft continues slow growth

Like what you're reading? Subscribe to GeekWire's free newsletters to catch every headline

Job Listings on GeekWork

Find more jobs on GeekWork. Employers, post a job here.