I am not running Exchange! I am running an IMAP server (Scalix).
When I go into Outlook and choose to Archive, the archive.pst file grows in the person's directory, just like it should. I had to learn to put a check mark in the box about "Archive even if do not archive is on" or something weird like that.
Anyways, the person's mailstore on the server may be 3GB. If I archive, the archive.pst will grow by about 2GB, but the mailstore remains unchanged at 3GB. is there another checkbox I should be hitting that says, in effect "remove the archived items from the server"?