> Does anyone know if there are any migration tools available??
> Typically I would want to be able to save/export all mail messages in
> default mail folders, custom mail folders and address book content.
You can take a look at the plugins page on the SM website. I believe you
should be able to find one called archive which can do the export of the
messages for you. Or, if you have access to the imap servers on both
sides, you should take a google for imap copy or imapsync.