"In mid July, anyone can have a shot at scoring the Yahoo! ID they want. In mid August, users who staked a claim on certain IDs can come to Yahoo! to discover which one they got."
"What if you haven’t logged into Yahoo! for over a year, but want to keep your Yahoo! ID? It’s easy. All you have to do is log on to any Yahoo! product before July 15th."
Note that they don't give an exact day for when you can stake a claim. It's just "mid July". That could be as late as July 20.
