Overview > Download > ActiveMQ 3.2.1 Release
This is the second release candiate release of 4.0.
This release of ActiveMQ includes a large number of [new features](New FeaturesFeatures/New Features/Features/New Features/changes-in-40) such as MasterSlave and [Message Groups](Consumer FeaturesFeatures/Consumer Features/Features/Consumer Features/message-groups) together with numerous bug fixes.
When upgrading from a previous release you are advised to clear down the journal files and persistent database first before upgrading to this jar as the binary format of messages is not compatible with 3.x or earlier 4.x releases.
The 4.x branch of ActiveMQ has now moved to the Apache Incubator so the package names have changed from org.activemq to org.apache.activemq. For a full list see the [Changes in 4.0](New FeaturesFeatures/New Features/Features/New Features/changes-in-40).
| Download | Description |
|---|---|
| activemq-release-4.0-RC2.zip | Binary Distribution in zip package |
| activemq-release-4.0-RC2-src.zip | Source Distribution in zip package |
| activemq-release-4.0-RC2.tar.gz | Binary Distribution in gz package |
| activemq-release-4.0-RC2-src.tar.gz | Source Distribution in gz package |
For a more detailed view of new features and bug fixes, see the release notes
Also see the previous ActiveMQ 4.0 M4 Release