I have a question regarding the database failover functionality in Exchange 2010. I have noticed that when we want to move the active copy of a mailbox database to another mailbox server, we get a dialog asking whether or not we want to override the automatic database mount dial on that server. After digging into this a bit, I'm finding information that I'm having a hard time understanding. Apparently, the default automatic database mount dial setting in Exchange 2010 SP1 RU2 is 'Good Availability'. According to the get-help on the set-mailboxserver cmdlet, using this setting (or any setting other than lossless) means that data may be lost during the failover. Is this accurate? Does this mean that by default, a mailbox database failover means data loss? Or, does the dial setting only apply to failovers and not switchovers (eg. when a server goes down vs. an admin moving the active DB) ? I have a really hard time believing that the Exchange 2010 product is set to allow data loss right out of the box. I hope that it's just a misunderstanding on my part. Any input on this?

Anyone have any information on this? Thanks for the help, I really appreciate it.

Anyone have anything? Anyone from the Microsoft side?

Quote: “data may be lost during the failover. Is this accurate?” Yes, it’s correct for failover, but not for switchover. Please see the example 3 in the “Move-ActiveMailboxDatabase” cmdlet James Luo TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com 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.

Perfect, this is exactly what I needed. Thanks for the help!