This statement sounds like the FBI spreading kitty litter to cover up a Richard Jewell type affair. With all e-mail addresses, I have had, I could have an unknown connection to the Unabomber for all I know. This e-mail appears to a thin connection at best and more a " look at all the work, we did" by the FBI.
Except his brother David told the bus story and there's no way David would back up the FBI's story if it wasn't true. You all are forgetting that Atta and Al Shehhi were in Norman July 2000 at least 7 months before Moussaoui was known to have arrived. Nick was attending OU in Norman the 1999-2000 school year. It could have been Atta or Al Shehhi he met on the bus, gave him his computer along with his password and email account (yeah, I give those to strangers too - not).
Al-Hazmi is ticketed for speeding in OK in April 2001 so he's also in the picture. Moussaoui is in OKC sometime in 2001 and is flying, but not landing, in Norman in Feb and Mar 2001. "A friend" (I'd like to know the ID of this friend) drove Moussaoui from Norman, OK to Minnesota Aug. 2001. The FBI finds the computer in Moussaoui's possession in Minnesota.