Duplicate Mac Mail notes

Question

Whenever I sync my BB with my notes in Mail.app on my Mac, I end up with multiple copies of notes on the Blackberry. There's only one copy of each note in mail.app, but even if I reset iSync history, reboot the Mac, wipe all the notes from the Blackberry and then select the "Replace all notes on this Blackberry device" option in Blackberry Desktop Manager, I still end up with multiple copies. What is going on? Has anyone else seen this behaviour?
If I then edit one of the notes on my Blackberry, then run a two-way sync, I end up with 3 copies of the note, of which 2 are original and one the edited version, and 2 copies on the Mac.
I'm running:
Bold 9700 v5.0.0.321
Blackberry Desktop Manager 1.0.2 (build 8)
Mac OS X 10.6.2 (Snow Leopard)
However, I had this problem previously when I was running Leopard and a Bold 9000.
Any ideas on how to fix it?

Answer 1

I've recently come across a couple of good threads which have info on this problem:
1. There seem to be some issues between Mac Mail and IMAP access to Gmail which cause notes to be saved in different places (under different labels in Gmail):
http://forums.macrumors.com/showthread.php?t=407306
2. Making sure Notes are only created "On My Mac" can help:
http://discussions.apple.com/thread.jspa?threadID=1376224
However, even after following all this advice (and doing other stuff like wiping the databases on my Blackberry), I still get 5 copies of each Note on my Blackberry, when there's only 1 in the Notes. So I thought I'd try a spotlight search for some of the text in one of my notes, which happened to be "Corelli Mandolin". Hey presto, 5 copies of the "Mail Message" (e.g. Note) turn up in different archive folders in Mail. See attached screenshot. 
After deleting the 4 other copies of mail (except the one in ~/Library/Mail/Mailboxes/Notes.mbox which is the real one), the problem is fixed for me.