If you've been doing Microsoft servers for long you know that Microsoft has patches and hotfixes that you only get by calling in and complaining about an issue. I don't see this GAB issue on the old setup so it's likely to be somethign they know about.
Then again we are running afoul of security suites that do the dumbest things in the name of privacy protection. It's like that firewall issue not long ago where the use chooses MAXIMUM SECURITY then asks why the internet does not work.
I have a question about Exchange 2010 global address book. We have issues with Outlook 2010 and Exchange 2010, by some weird reason global address book doesn't get update on Outlook 2010 (but works fine on Outlook 2003 & 2007 as well as web access). We tried deleting the local address book and let the server push out the updated version, but after local machine reboot the global address book reverted back to the older version. We did sp2 upgrade for Exchange, that didn't help.