At the bottom of a Confluence page you will see a line like this:

Powered by Atlassian Confluence 2.10.1, the Enterprise Wiki. Bug/feature request - Atlassian news - Contact administrators

In the above it means that you are running Confluence version 2.10.1.

If you do not see that line, you can visit http://<Your Confluence URL>/admin/systeminfo.action and find out the version from there.

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