exchange 2010 configuration question

I have a question regarding exchange 2010 and OWA 2003

I have an exchange setup that I inherited. with the following setup

Internet ->FW->ANTISPAM APPLIANCE->XCHNGFE-->MAIL4

antispam appliance = sonicwall email security 300

XCHNGFE is a exchange 2003 std server that just runs the OWA services and also has symantec mail security on it.

MAIL4 is an exchange 2003 std server

we are looking to get another server that will replace MAIL4 with a win2k8R2 server running Exchange 2010.

Can I just add the additional server, migrate my mailboxes off mail4 and still use XCHNGFE running OWA from exchange 2003 or does that NEED to be upgraded as well? The upgrade path is painful since it will require an OS upgrade as well as exchange. I would rather not but I do want to keep that server as a front end to handle OWA and the gateway AV.

 
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jbla9028Asked:
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geieeaConnect With a Mentor Commented:
You'll need to set up the 2010 server w/ all the roles (CAS,HUB, & MBX). Another option - set up a separate CAS/HUB server and one MBX server.
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geieeaCommented:
The 2003 FE server will not work w/ 2010 mailbox (backend) server.
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