Adobe has released Flash Player 10.1, new version of Flash will support the variety of mobile devices, including the upcoming release of Windows Phone 7. When introducing the Flash Player 10.1, Adobe Labs version of Flash that adds support for more platforms.
"Flash Player support for mobile operating systems include: Android, Microsoft Windows Phone 7, Palm webOS and Symbian S60 Fifth Edition."
According to Microsoft, saying before, they will begin immediately after the release of Flash 10.1 brought WP7 on its features, even WP7 listing could not achieve this functionality, Microsoft is most likely through a firmware upgrade to support the Flash Player 10.1.