Hi Emmanuel,

  You can retrieve all the messages from the "All Mail" folder via IMAP and 
use the X-GM-LABELS Gmail IMAP extension to find out what labels each 
message has. This means you'll only be grabbing each message once.

http://code.google.com/apis/gmail/imap/#x-gm-labels 

The only messages this won't get is whatever is in Trash or Spam, those 
you'll need to grab separately if you need them.

Jay

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