phpBB is free and open source forum software that is easy to use, powerful, and highly customisable. Our community offers extensive support to end users. Features of phpBB include support for multiple database engines (PostgreSQL, SQLite, MySQL, Oracle, Microsoft SQL Server), flat message structure (as opposed to threaded), hierarchical subforums, topic split/merge/lock, user groups, multiple attachments per post, full-text search, plugins and various notification options (e-mail, Jabber instant messaging, ATOM feeds).
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