I'm looking for a HCL for Exchange 2007. We are planning to install Exchange 2007 on a IBM I5/OS, Version 6 Release 1 Mod 0, H Bladecenter. I cannot seem to find an HCL for Exchange 2007, only Server 08. Also we have in place 2 Exchange 03 servers now in the netowrk on same subnet one is on the I5 H Bladecenter now, the other is on stand alone hadware. Both Exhcange 03 versions are 6.5 Build 7638.2 SP2, running on a 2003 server SP2 (on I5), and a 2000 server SP2. Any consideration will be appreciated.