Exchange 2010 MBX with a Exchange 2003 Frontend server. Coexist?

We currently have a exchange 2003 environment with 5 mailbox server and 1 front end server. We would like to introduce a 2010 Exchange MBX server. Is that possible? Do we just install the MBX role with CAS/HT? 
Thnaks, 

Hi 
You need to have MBX,CAS and HUB all the three in Exchange 2010 else they wont be functioning without any one of them.
You can introduce Exchange 2010 server in Exchange 2003 server environment 
Ensure you have at-least Exchange server 2003 SP2 else the it wont allow you to install Exchange 2010 
You can only deploy Exchange 2010 in an Exchange 2003 organization that operates in native mode
Below article for your reference 
http://technet.microsoft.com/en-us/library/aa998604(v=exchg.141).aspx
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you.
Regards,
Sathish

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