Many of those were graphics-intensive games, which was the result of a new rendering engine, DirectX 10, introduced for Vista. But there are also a number of business and utility applications that have not been updated to ensure Vista compatibility. For instance, the latest version of Skype doesn't work on Vista. Firefox does work, though Mozilla has documented .

Most of Adobe's multimedia software won't be officially supported for Vista until the middle of this year, though many applications can run today with minor problems ().

Adobe, which will face competition from Microsoft this year when Microsoft releases its suite of graphics and multimedia design tools, did not immediately return a request to comment.

Symantec is already facing similar competition from Microsoft, which released its OneCare security suite last year.

In statements on its Web site aimed at and , Symantec said some of its software, such as Norton AntiVirus 2007, already works with Vista. Other Symantec software, such as Ghost 12, won't be ready until mid-April.