Microsoft has revealed the 25 brands that have agreed to run in-app ad programmes in the new Windows 8 operating system, which launched last month.
Citi, Trend Micro and Vodafone are among the launch partners.
The campaigns will begin rolling out over the coming months.
Frank Holland, corporate vice president of advertising and online business at Microsoft, said, “These advertising experiences within Windows 8 apps will be smarter, richer, more relevant and more valuable to consumers.”