After trying to write my own IMAP tool to migrate google apps mail from one google apps account to another and getting hung up trying to apply the proper flags, I discovered larch - a ruby script.
So I downloaded ruby for windows:
http://rubyinstaller.org/downloads/
Ran 'Start Command Prompt with Ruby' from the start menu and issued the command
gem install larch
Ran 'larch --help' to discover the arguments and I'm on my way!
It failed once but I ran it again and it picks up from where it left off - sweet!
Ryan Grove is the man! Thanks Ryan!