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Some Important points about DAG to get you started:

DAG can have an incremental deployment, which means, you can have a highly available deployment even if initially you have installed the standalone mailbox servers. However, if you plan to do so, make sure that you are using Enterprise edition of Windows Server 2008 because DAG uses Windows Failover clustering in the backend.

DAG can comprise of maximum 16 mailbox servers hence there can be a maximum of 16 database copies across DAG.

DAG can span across Active Directory sites (physical locations).

DAG uses TCP socket (not SMB) to replicate logs hence it is possible to customize the port for DAG replication and compress the log shipping.

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It’s good to share useful information. Here is an excellent information and whitepaper to secure the publishing of Microsoft Exchange. Must to know for an Exchange engineer.

My favorite and and as expected an excellent article from Exchange Team

http://blogs.technet.com/b/exchange/archive/2010/12/06/3411637.aspx

Whitepaper: Using IPSec to Secure access to Exchange

http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=23708

Whitepaper: Publishing Exchange using Forefront

http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=8946

Hi,

Since Exchange Server 2010 RC is around the corner, it’s good to know some new features of Exchange 2010. The feature I liked the most out of the ones mentioned in following articles is the ability of the users to modify GAL (Obviously with ACL and Scope defined by Administrator).

http://www.msexchange.org/articles_tutorials/exchange-server-2010/migration-deployment/using-disclaimer-exchange-server-2010.html#

http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/management-administration/exchange-2010-management-architecture-single-machine-manage-multiple-exchange-2010-organizations.html#

http://www.msexchange.org/articles_tutorials/exchange-server-2010/migration-deployment/installing-exchange-server-2010-beta-part1.html#

Cheers…
-V