How to get a threaded view of archived mail messages?

I’m a long time DEVONthink Pro user, but I’m trying out Pro Office specifically to see how well it’s mail archiving features work.

Please tell me that there’s some way to view the archived messages in a threaded view (i.e. grouped by subject) and I’m just not seeing it.

You can create threaded groups upon import by checking the corresponding option in the Mail preference pane. Once the messages are imported they are treated like any other document type.

Thanks, Annard, that did the trick!