Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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A Release Candidate (RC) is a preliminary release leading up to the official release of a JIRA version. RC releases are a fairly stable snapshot of our work in progress and provide an advance preview of new features to the general public. JIRA plugin developers can also use RC releases to test and fix their plugins in advance of an official release.
Do not use in production
RC releases should not be used in production environments as they are not officially supported.
Please also take note of the following information: