Confluence 4.1 : How do I obtain content that hasn't been modified in a certain period of time

Via the Archiving Plugin

The Archiving Plugin is a great tool for managing outdated content.

Via SQL

This can be achieved by running the following SQL query on your Confluence database.

select * from content as c, spaces as s where c.spaceid = s.spaceid and s.spacename='INSERT SPACE NAME HERE' and c.LASTMODDATE < 'INSERT DATE HERE';