how to extract emails from the message queue in exchange 2007

Start the exchange management console
Mark the message as suspended in the queue
Collect the message properties so you have the queue and message ID
Start the exchange management shell

Export-Message -Identity EXCHSRV\5000\10000 -Path "C:\export\exported-email.eml"

5000 is the queue ID
10000 is the message ID

Export the entire queue (I have not tested this)
http://technet.microsoft.com/en-us/library/bb125215%28v=exchg.80%29