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