Katsumi Yamaoka wrote:
> Last night I realized that I'm unable to reproduce this, too, in
> home Linux PC.  As for me it happens only in the office PC.

I found the cause of this problem at last.  This happens with at
least cygwin Emacs.  Don't you (nyc4bos@aol.com) use it?
In that platform,

(nth 1 (file-attributes nndraft-directory))

always returns 1 even though there are subdirectories in it.  So,
`nndraft-request-list' (i.e. `nnmh-request-list') doesn't recognize
it as a directory and draft messages in those subdirectories won't
be counted.  A temporary patch is attached.  What I should do next
is to learn what `subdirectoriesp' is for.