Question about archive

I like em client so much but I have two things want to ask.

The First is that I set the auto archive. The archived mail has a “archive” bottom at top menu.
When i click the “archive” bottom, my mail is disappear. What work the bottom for? Shouldn’t to archive mail when that is not archived? Why it show up at archived mail?

The Second is that I use em Client for exchange mail. But the lync’s conversation record file is not sync to em Client. Why?