RPC over HTTPs via ISA for multiple Exchange servers ?

Hi everyone,

We had our exchange 2003 email system for about 5 years now and we use ISA Server to publish RPC over HTTPs from Exch2003 server.

Recently I have installed Exchange 2007 server named Exch2007 and would like to migrate all email from the old server to the new one

Problem: Since the migration takes a lot longer than expected, we have to do this on 2 different weekend, how can configure the ISA to allow users on both exchange servers (old and new) to access RPC over Https ? For now I have tested migrating a couple of users and the configuration switched automatically but  email was not accessible anymore via RPC.

DC: Windows 2003
Exchange 2003 SP2: Windows 2003
Exchange 2007: Windows 2003
ISA 2006 Std: Windows 2003

Please help
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Johnny_NguyenAsked:
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Steven WellsConnect With a Mentor Systems AdministratorCommented:
You should probably configure ISA to publish the 2007 version of the OWA. From memory exchange 2007 will proxy the request back to the 2003 server.

http://technet.microsoft.com/en-us/library/bb885041(v=exchg.80).aspx
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