In many organizations, the impact of taking the BES server offline is not a viable option, hence, there is an improvement in high availability straight out of the box, which allows us to schedule maintenance on our BES server by using the warm standby instance, as pointed out in the last chapter. If the strategy of upgrading is not viable for your infrastructure, we can upgrade to BES 5 by installing a fresh instance of the new BES server on a new server (you can still use the same BESAdmin account to carry out the installation) and then using the Transporter tool to migrate the users across. Using this tool means that we do not need to wipe handhelds down and reactivate them on the new server.

This tool helps us to migrate users to our new BlackBerry domain that we create on the new server. This scenario requires the following: