Shadow Redundancy

Question / Problem

How does the Exchange Server Toolbox handle Shadow Redundancy?

Answer / Solution

The Exchange Server Toolbox can be easily used in a shadow redundancy configuration. You need a seperate installation and license for every Exchange Server. One of the installations should be set up as master with all other installations configured as clients.

An email that arrives at one of the Exchange Servers is processed by its local Exchange Server Toolbox installation regardless of whether it is the master or a client. The rules are applied locally, which means that rules with the condition "Machine name equals text" can be used here.

The master installation is always used for archiving, regardless of which installation processed the email. This also means that to use the Outlook Add-in's archive search functionality, Outlook installations need to connect to the master installation.
In case the master installation cannot be reached the Exchange Server Toolbox will store the emails in a local queue with built in failure protection and relay them to the master installation as soon as it is reachable again.