How to move mailbox from Exchange 2010 to Exchange 2003

Hi:

I got a situation, which need to move a mailbox  from Exchange 2010 to Exchange 2003.

I search the forum and found couple of thread about this topic, but none of them give the detail command to do so.

in My environment, it's pretty simple. 

I have an exchange server 2003, and i installed a new exchange server 2010, and moved all mailbox from exchange 2003 to that new exchange server 2010.

I know i need to use "new-moverequest" command to move the mailbox back.

but in the command, when i specify the "-targetdatabase", i don't know which database name should i use...the name structure of exchange 2010  is totally different than exchange 2003

Where should i found the "-targetdatabase" , which is the exchange 2003 database? 

Thanks!