Microsoft has licensed Adobe's software for viewing online videos and other files on mobile phones, the companies have confirmed.
Microsoft will distribute Flash Lite and Reader programs from Adobe Systems to mobile phone makers who use its Windows Mobile software.
Flash also allows users to interact with more web sites. It's the software behind most shopping sites where you can view an item in different colours or try out house paint colours on a virtual home.
"Flash content is the most prolific content on the web today; it is the way people express themselves on the internet," said Adobe spokesman Gary Kovacs.
Julie Ask, an analyst at Juniper Research, said mobile customers are more likely to browse the web when they have more capable phones. "The more likely they are to use it, the more that folks are willing to invest in the platform, and the more likely there are to be page views. It's good for advertisers, it's good for carriers," she added.