Exchange 2003 in 2 sites - Best way to configure OWA

I have (2) Exchange 2003 servers in (2) sites, separated by a PPP link.  The servers talk back and forth to each other, and each server is running OWA, (1) single storage group each with a PRIV database and a PUB database.

We recently introduced the 2nd server into a single server environment, and the MX record for the organization lands email on SITE A, which then routes email across the PPP link to recipients that are in SITE B.  Everything flows fine.

When it comes to OWA, however, when users at SITE B sign into OWA over the internet at SITE A like they always did, after they sign in, their URL is changed to "http://EXCHANGE02.myorg.local" from "".

I do NOT have any other servers to dedicated as a frontend server for this situation.

My question is:  Can I just check the box on the original Exchange server at SITE A to make that server a FRONTEND SERVER, leaving the mailboxes that are on it there, and expect OWA to now service not only the local server at SITE A, but also to service the local server at SITE B. ?  I'm not sure if changing the server to a FRONTEND SERVER will actually PREVENT the store front working.  I know it's not a best practice to do this, but as I said, we CANNOT dedicate a 2nd server at this time to being a Frontend ONLY server.

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Justin OwensConnect With a Mentor ITIL Problem ManagerCommented:
If you check that box you will remove mailbox access rights on that server (I have actually made that mistake in production...  Was not a fun moment for me).  Front End servers really cannot have mailboxes on them and work properly.
jkeegan123Author Commented:
So other than creating a separate OWA address through the firewall of the other site, utilizing a different host name in the DNS zone on the internet, is there any way besides dedicating access via a stand alone front end server?
Justin OwensITIL Problem ManagerCommented:
Unfortunately, no.
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