My company needs to upgrade our tracking system from its very old version 3.10.2 to the latest. We need to move the existing everything ( projects, workflows, users..etc) to the newest version. I need to know how can we move our old work as it is and what are the risks that we might face. Thank you!
There's not a lot of information here to tell you what specific risks you might have.
Please have a read through https://confluence.atlassian.com/display/JIRA/Upgrading+JIRA to start with and see if there's anything in there that you don't understand or highlights any concerns about your setup.
The only question I can pre-empt really is that you're going to ask about versions - I would upgrade to 3.13, then 4.0, then 4.4, then 5.1 then 6.4
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