It seems that the search for Orphaned Pages is checking for incoming links. However, if a page is only used via the include macro, that should count as reference as well. I've just deleted many pages assuming they were unused

Btw.: a feature to bulk delete orphaned pages would be very appreciated. I'm now doing it page by page via script which runs forever.

Runtime Information
Database Dialect com.atlassian.hibernate.dialect.MySQLDialect
Database Connection URL java:comp/env/jdbc/confluence
Database Driver Name
Database Driver Version 5.1
Database Connection Transaction Isolation Repeatable read
Database name MySQL
Database version 5.0.22-Debian_0ubuntu6.06.9-log
Database Latency 0 ms
Application Server Apache Tomcat/5.5.26
Servlet Version 2.4
Server Base Url http://www.molyb.org/confluence
Confluence Home /data/confluence
Uptime 1 month, 5 days, 12 hours, 13 minutes, 45 seconds
Confluence Version 2.8.1
Build Number 1322