>More significant from a tax standpoint is that you start a new holding period. No, the replacement property is deemed identical to the disposed property in every respect including such attributes as "acquired on 16 January 2007". The holding period (which is measured in months rather than days for those who attend to such minutia) includes the holding period of the disposed property and the period (if any) one is flat the shares in the interim.
"Logic and taxation are not always the best of friends." --Supreme Court Justice James C. McReynolds (Sonneborn Bros. v. Cureton)