When upgrading Release 5 Message Queue to Release 5U1, consider the following aspects of the upgrade process:
General Upgrade Approach. The upgrade is achieved by patching Release 5 Message Queue.
Upgrade Dependencies. Message Queue has dependencies on a number of Java ES shared components, (see Table 1–8), none of which need to be upgraded when you perform a maintenance upgrade of Message Queue. However, Message Queue requires that Windows Installer patch (126910–02) is already applied.
Backward Compatibility. Release 5U1 Message Queue is backwardly compatible with the Release 5 version.
Upgrade Rollback. You can do a rollback of the Release 5 upgrade by reverting to the previous version, which is left intact by the upgrade.