The probability listings for each bucket are numbered from greatest to least, probability wise. All of the scores from each word that is classified and deemed to belong in a specific bucket are tallied and added up to derive the bucket scores. A probability of 1 (the highest possible score) means that POPFile is quite certain that message belongs in that particular bucket. The numbers below the number 1 bucket are listed using “floating point math”. A probability of 3.782315e-144 is equal to 0.000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000000000000003782315 (I think I got all the 0's in there!). Obviously, a very small number and a very small probability.