Found another SCW related issue. I've tried to apply SCW including Mailbox Cluster rules on both nodes multiple times, but although there is an Inbound rule in the Windows filtering platform (firewall) for "Microsoft Exchange - System Attendent (In)" ~ mad.exe, it does not seem to work. The result is that Outlook Anywhere does not work because connections from RPC Proxy on source port 6004 are being blocked and you can find that in the Security Log of the CMS.
I had to manually add another Inbound rule for ..binmad.exe with the exact same parameters as SCW applied and then it worked like a charm. It's weird because i could not find any differences between the default and the manually created rule...
It looks like the Exchange2007_WinSrv2008.xml template is not really processed correctly while applying SCW for some occult reason.
Wanted to share that out, not sure if anyone else ran into this before. Probably :)