Maybe he's asking about labels? That's kind of the gmail feature I wouldn't find in any email client. It would be sort of emaildirectories as under any email client plus soft links between them? Any ways, if someone knows about such thing I would like to know aswell, :)
Something like virtual folders in Evolution? --To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]