I don't know either, and tbh I don't think it matters all that much, but 2007 is generally regarded as his debut season as a pro (at least, I've heard it said many times that by winning 11 races that year, he equalled Petacchi's record for number of wins in a "debut season"), so I guess anything before that doesn't really count. Unless you want it to…
In 2006, with Sparkasse, he won two stages of the Tour of Berlin which afaict is/was a 2.2 race... So should that count?
Who knows?
Anyway, sod this - I'm going out to ride my bike.