I'm not sure what happened, but I don't see Archive mailbox in Mail.app.
Compared to iCloud.com, there is a Archive directory.
Wha might be wrong? How can I bring back the Archive box in Mail.app? I use Mac OS X 10.10.1.
I don't know exactly what happened, but the box comes and goes. I set the Archive box in the favorite toolbar so that I can bring it up when it's not showing itself.