Hello, I want to install 2 edge Exchange 2010 Sp1 servers into a DMZ. Will these servers have an automatically failover; or do I have to setup 2 edge synch's to cas/hub on the intranet and have DNS balanced record to use both edges ? Are there some document's explaining the pro/cons on having 2 edge servers in a DMZ and what to take into considerations ? Regards Peter

You will need to subscribe both Edge servers for the Hub Transport servers to use them. http://technet.microsoft.com/en-us/library/bb267003(EXCHG.80).aspx Although personally I fail to see the point in Edge servers anyway... waste of an Exchange licence. I can achieve about 90% of the functionality with third party products for a lot less than than the cost of an Exchange licence (and the missing 10% of features I don't care about). Simon.Simon Butler, Exchange MVP Blog | Exchange Resources

“Deploying more than one Edge Transport server provides redundancy and failover capabilities for your inbound message flow. You can load-balance SMTP traffic to your organization between Edge Transport servers by defining more than one mail exchange (MX) resource record with the same priority in the Domain Name System (DNS) database for your mail domain” ----------Refer to <Overview of the Edge Transport Server Role> “The Edge Transport server automatically load balances inbound SMTP traffic to all Hub Transport servers in the Active Directory site to which the Edge Transport server is subscribed” ----------Refer to <Understanding High Availability and Site Resilience > The new feature in exchange 2010SP1, “Shadow Redundancy Promotion” will also help to protect the messages in transit Notes: It’s disabled by default Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

“Deploying more than one Edge Transport server provides redundancy and failover capabilities for your inbound message flow. You can load-balance SMTP traffic to your organization between Edge Transport servers by defining more than one mail exchange (MX) resource record with the same priority in the Domain Name System (DNS) database for your mail domain” ----------Refer to <Overview of the Edge Transport Server Role> “The Edge Transport server automatically load balances inbound SMTP traffic to all Hub Transport servers in the Active Directory site to which the Edge Transport server is subscribed” ----------Refer to <Understanding High Availability and Site Resilience > The new feature in exchange 2010SP1, “Shadow Redundancy Promotion” will also help to protect the messages in transit Notes: It’s disabled by defaultPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

I have successfull done this in my org without using a edge syn or subcribtion use this link http://technet.microsoft.com/en-us/library/bb232082(EXCHG.80).aspx