may be there is a problem to delete mails from folder send and inbox when you use the Edge Browser.In my case i can mark the mails (one by one). But when i push the trash button on the rigth site nothing will go on. It is also not possible to mark more than one mail for deleting. With IE and FF it works.
Mysterious...After a new installation of NS7 RC3 inclusive SOGo I can move the mails from the folders into the recycle bin. No idea why this now works.
It does not work with Final either, last update 01.06.2017, in no browser.New install, no update, but after update it' happend.