Hello,

Build 7699 here, tried with edge, chrome, brave and firefox. All let me drag successfully e-mails to folders.

Kind regards.

rebooted wkst and server.. now seems to work..  strange...

Mitch, this is a strange one and not something I've seen reported previously. Based on your results (and the reboot fixing it) though I'd suspect issues involving the application pool or SignalR (WebSockets) installation. Do you get anything in the event viewer in Windows in and around that time that might point at a culprit?