Vista - RC1 - recovered folders

I sent as feedback - posting here as an FYI.
My upgrade to 64bit RC1 failed twice and then updated OK. Now I noticed
that in Mail I had 2 "recovered folders" and no other mail and an empty
"MS newsgroup" news client The " recovered folders" contained 2
folders - one from each failure named 10-2006-00numbers. In the top one
was only an inbox with 19 msgs. The other contained all my old
folders/mail - except for those 19. So I moved all mail into the now
empty corresponding mail folders and had to recreate the ms newsgroups.
I didn't try copying the dbx files yet (on another PC now) to see if I
could avoid downloading everything again.