In addition to its own Silverlight multimedia technology, Microsoft will support Adobe’s competing Flash technology on Windows Mobile phones, the companies planned to announce on Monday.

Microsoft has licensed Adobe Flash Lite, the Flash Player runtime for mobile devices, so that Windows Mobile phone users can view Flash content in the Internet Explorer Mobile browser. Microsoft has also licensed the Adobe Reader LE software, so that Windows Mobile users will be able to view PDF documents.

The announcement means Windows Mobile phones will support both Flash and Silverlight, Microsoft’s own fledgling technology that lets developers build multimedia Internet applications that run in browsers.