Conversation so far:
When did Ray with Jamie Foxx come out?
Ray with Jamie Foxx came out in 2004
Was Unpredictable a movie with Jamie Foxx?
Unpredictable is Jamie Foxx's second studio album
What film did Jamie Foxx win an award for?
Jamie Foxx won an award for the film Ray
What category did Jamie Foxx win for the film Ray?
Jamie Foxx won the Academy Award, BAFTA, Screen Actors Guild Award, Critics' Choice Movie Award and Golden Globe Award for Best Actor for the film Ray
When was Dreamgirls with Jamie Foxx released?
Dreamgirls with Jamie Foxx was released in 2006

Question: What was his most successful project during this time?
Self-contained rewrite: What was Jamie Foxx's most successful project during this time around 2006 when Dreamgirls was released?