I use eMailcliënt Versie 8.0.2951 (e2fe9f0).
When I choose “Move to archive” my message disappeares and is nog to find anywhwer.
It seems to be an error in the application. For when I choose “Move to map” and I select Archive it works well.
I lost some important mails. Even on the webmail of the provider the mails are gone.
Thanks for the suggestion. There were 3 updates. But that was not the problem. Move to archive sends the mail to a local map. There I found alle the lost mails. So I am glad to say now: Problem solved.