Using the phased upgrade process, you can maintain previous versions of the BlackBerry® Enterprise Server software, install additional BlackBerry Enterprise Server instances over time, and move user accounts to the latest BlackBerry Enterprise Server versions.
When you use the in-place upgrade process, all BlackBerry devices receive new IT policies. BlackBerry devices that are running BlackBerry® Device Software version 4.0 or later receive new service books and wireless data synchronization occurs. When you move user accounts, the BlackBerry Messaging Agent copies the BlackBerry state databases to the new BlackBerry Enterprise Server.
- You can move user accounts to the new BlackBerry Enterprise Server instances gradually to limit the number of service books and IT policies that the BlackBerry Policy Service sends to BlackBerry devices at the same time.
- You can monitor system performance as you add user accounts.
- You can change your organization's environment during the upgrade process by changing which user accounts you associate with each BlackBerry Enterprise Server instance.
- You require extra computers.
- You require additional SRP credentials.
- If you move user accounts from one BlackBerry Configuration Database to another, you lose the BlackBerry device options that you backed up in the BlackBerry Configuration Database.
- You cannot use some new features (for example, one-to-many relationships between a BlackBerry MDS Connection Service or BlackBerry Collaboration Service and multiple BlackBerry Enterprise Server instances) in the BlackBerry Enterprise Server until all BlackBerry Enterprise Server components are the same version.