Documentation for JIRA 4.1. Documentation for other versions of JIRA is available too. 
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JIRA 4.1.2 has been released. Read the full JIRA 4.1.2 Release Notes and Upgrade Guide.
Don't have JIRA 4.1? Take a look at the features of JIRA's latest major version and try it out!
26 February 2010 The Atlassian JIRA team is proud to announce the release of JIRA 4.0.2. This point release contains over 40 bug fixes and improvements, notably including:
JIRA 4.0.2 is of course free to all customers with active JIRA software maintenance.
Don't have JIRA 4 yet?
Take a look at all the new features in the JIRA 4.0 Release Notes and see what you are missing out on!
If you are upgrading, please read the JIRA 4.0.2 Upgrade Guide.
JIRA 4.0.2 includes the following updates and bug fixes: