I would check out the 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, and 5.8 upgrade notes. There have been lots of changes.
5.2
https://confluence.atlassian.com/doc/confluence-5-2-upgrade-notes-338365678.html
5.3
https://confluence.atlassian.com/doc/confluence-5-3-upgrade-notes-389284515.html
5.4
https://confluence.atlassian.com/doc/confluence-5-4-upgrade-notes-416055872.html
5.5
https://confluence.atlassian.com/doc/confluence-5-5-upgrade-notes-435552950.html
5.6
https://confluence.atlassian.com/doc/confluence-5-6-upgrade-notes-648381544.html
5.7
https://confluence.atlassian.com/doc/confluence-5-7-upgrade-notes-692781383.html
5.8
https://confluence.atlassian.com/doc/confluence-5-8-upgrade-notes-744325378.html
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