Being able to use a Search Folder to include mails marked as Follow-Up, but not those marked completed.

Other information:
In Outlook, you can create a Favorite Folder containing only those mails that you have marked as Follow-Ups. Once you complete a follow-up, the mail disappears from this folder. This is a very nice feature that enables you to easily keep track of what you have completed and not.

In Evolution, you can do the same with Search Folder but with one huge difference, even though you have marked a follow-up as completed, it is still listed in this search folder. I cannot filter out those who are completed. This severely handicaps this feature making it not useful.