Jane: The SSLOffloaded key should only affect connections to Exchange 2003 servers. Exchange 2007 OWA should handle SSL offloading without any problems. Is there a particular error message you're seeing?
Amir: we updated the article to get rid of "exchweb" on MBX-only servers. Thanks for pointing it out. It was a mistake on my part. I deliberately left out exadmin because it doesn't affect OWA (it's for DAV), but I accidentally put in an extra exchweb.
David:
1. It's hard to say based on your description of the problem :) My suggestion would be to call PSS (Microsoft's tech support). They can walk you through troubleshooting it. One thing you might want to checj is whether /owa is configured for ASP.NET 2.0. Look at the ASP.NET tab for /owa in the IIS GUI manager.
2. Yes, I think this should be possible. Just make sure that there is a MBX server somewhere in the AD site or else users won't be able to access OWA 2007.