Microsoft says it is on track to sell 1 million Zune devices by June of next year, based on the sales of the new digital music device since its Nov. 14 launch.

Specific sales figures for November will not be available until after the NPD Group issues its retail data next week. In an earlier release, NPD said Microsoft captured 9% of the unit share and 13% of the dollar share spent on portable digital music players in the first week after the Zune debuted. This placed it squarely in the No. 2 position for the week, ahead of the Sansa Rhapsody from SanDisk.

However, the following week, sales slipped, with the Zune dropping to fifth position, according to NPD data.

Microsoft said it is continuing its marketing efforts, which include TV ads on hit shows "Heroes," "Prison Break" and "The Daily Show," as well as a variety of music-related magazines.