I found something, I guess
The below is some part of "Spam Clues" report of my friend. Top part of tokens section is fine. It shows no sign of spam. Bottom part of it shows some spam clues, and total is %45
 
<pre>
<b>Combined Score: 45% (0.4548)
Internal ham score (*H*): 1
Internal spam score (*S*): 0.909599</b>

# ham trained on: 2559
# spam trained on: 48

40 Significant Tokens

<b>token                               spamprob         #ham  #spam
</b>.....
'header:MIME-Version:1'             0.622183         1522     48
'this'                              0.695978         1049     46
'date:'                             0.741391          801     44
'free'                              0.851694          399     44
'found'                             0.876964          321     44
'release'                           0.887758          289     44
'checked'                           0.895329          267     44
'virus'                             0.899162          256     44
'message.'                          0.899511          255     44
'edition.'                          0.899862          254     44
'database:'                         0.905145          239     44
'incoming'                          0.9055            238     44
'avg'                               0.905854          237     44
'version:'                          0.905854          237     44
'7.5.484'                           0.973684           57     44
'269.13.1/982'                      0.993601            2     39
'31-aug-07'                         0.993601            2     39
'5:21'                              0.993601            2     39
</pre>

This is an email from SpamBayes

<pre>
<b>Combined Score: 0% (0)
Internal ham score (*H*): 1
Internal spam score (*S*): 0
</b>
# ham trained on: 2559
# spam trained on: 50

150 Significant Tokens
<b>token                               spamprob         #ham  #spam</b>
'skip:- 10'                         0.000314048       716      0
"i'm"                               0.000324465       693      0
'url:html'                          0.000605734       371      0
'online:'                           0.000989228       227      0
'mailing'                           0.00102064        220      0
'data'                              0.0011169         201      0
'looking'                           0.0011169         201      0
'doing'                             0.00131234        171      0
'try'                               0.00135993        165      0
'having'                            0.0014111         159      0
'copy'                              0.00161348        139      0
'files'                             0.00161348        139      0
'file'                              0.00173812        129      0
...
'message'                           0.151436          288      1
'bug,'                              0.155172            1      0
'bug.'                              0.155172            1      0
'environment?'                      0.155172            1      0
'outgrowth'                         0.155172            1      0
'similar,'                          0.155172            1      0
'subscribing'                       0.155172            1      0
'this!'                             0.155172            1      0
'from:no real name:2**0'            0.832851          112     11
'to:no real name:2**0'              0.847284          331     36
'free'                              0.849132          399     44
'outlook'                           0.871205            6      1
'found'                             0.874777          321     44
'release'                           0.88574           289     44
'subject:list'                      0.892519            1      1
'checked'                           0.893433          267     44
'subject:your'                      0.895863           34      6
'skip:- 20'                         0.896145           10      2
'virus'                             0.897327          256     44
'message.'                          0.897683          255     44
'edition.'                          0.898039          254     44
'database:'                         0.90341           239     44
'incoming'                          0.90377           238     44
'avg'                               0.904131          237     44
'version:'                          0.904131          237     44
'7.5.484'                           0.973205           57     44
'269.13.1/982'                      0.993582            2     39
'31-aug-07'                         0.993582            2     39
'5:21'                              0.993582            2     39
</pre>

How is that possible 2 similar token list, and one of them gets %45, the other is %0 ?

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