Correct Answer:
Explanation/Reference:
http://technet.microsoft.com/en-us/library/bb124151(v=exchg.150).aspx
The ShadowMessagePreferenceSetting parameter specifies the preferred location for making a shadow copy of a message. Valid values are:
LocalOnly: A shadow copy of the message should only be made on a server in the local Active Directory site.
RemoteOnly: A shadow copy of the message should only be made on a server in a different Active Directory site.
PreferRemote: Try to make a shadow copy of the message in a different Active Directory site. If the operation fails, try make a shadow copy of the message on a server in the local Active Directory site.
The default value is PreferRemote.
The MaxRetriesForRemoteSiteShadow parameter specifies the maximum number of attempts to make a shadow copy of the message in a different Active Directory site. Valid input for this parameter is an integer between 0 and 255. The default value is 4. The total number of attempts to create a shadow copy of the message is controlled by the ShadowMessagePreferenceSetting parameter:
If ShadowMessagePreferenceSetting is set to RemoteOnly, the total number of attempts to make a shadow copy of the message is the value of the MaxRetriesForRemoteSiteShadow parameter.
If ShadowMessagePreferenceSetting is set to PreferRemote, the total number of attempts to make a shadow copy of the message is the value of the MaxRetriesForLocalSiteShadow and MaxRetriesForRemoteSiteShadow parameters added together.
If ShadowMessagePreferenceSetting is set to LocalOnly, the value of MaxRetriesForRemoteSiteShadow is 0, and the MaxRetriesForRemoteSiteShadow parameter has no effect on the total number of attempts to create a shadow copy of the message.
If a shadow copy of the message isn’t created after the specified number of attempts, accepting or rejecting the message is controlled by the RejectMessageOnShadowFailure parameter.
