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You can now send an email message directly from the Confluence user administration screen, inviting people to join the site. We have also clarified the signup modes as public, private, or disabled.

Upgrading from a previous version of Confluence should be fairly straightforward. Please read the Confluence 4.2.5 Upgrade Notes. We strongly recommend that you back up your confluence.home directory and database before upgrading.
If your version of Confluence is earlier than 3.5.x, then you should upgrade to Confluence 3.5.x before upgrading to Confluence 4.2.x.
