The Deleted Messages folder had (as seen in Windows Explorer) grown to 33 MB. I deleted many really old emails from it, and re-indexed. This reduced it to 9 MB. Within a day or so, it again contained many really old messages. It was back to 33 MB.
I have read in another thread that when you empty a folder, right-click and choose Recover deleted space. But my situation is different: I do want to keep recently deleted messages.
How can I resolve my problem?
...chris