[Spambayes] rebuild database?

[mgleich]

I'm using the Outlook plugin with Outlook 2002.
 
Recently I've been getting some false negatives - essentially, email from
friends that is suddenly placed in the questionable, or suspect folder when
many other emails from these friends have been processed and seen as ham.
 
I began by training as I went, no prior collection of email on which to
train.
 
I'm wondering - should the box that says "rebuild entire database" be
checked by default? 
 
Also, my database is now 2,536 kb - is this too large?
 
Louise
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