Upgrading JIRA 2.x Data to JIRA 4.0
If you are upgrading from JIRA 2.x data (or earlier) to JIRA 4.0, you must upgrade to any JIRA 3.x release first (3.13.5 recommended). You can then follow the JIRA 4.0 Upgrade Guide to upgrade your JIRA instance to 4.0.
Last modified on Oct 21, 2009
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