After upgrading the EM Client to v8 on Mac i get endless loop to enter credentials and it stops connecting to an account on Exchange server. The credentials are ok (i can log in to an OWA with them). If i downgrade back to v7, connection to the Exchange account and synchronization starts working again.
Are you using an antivirus? They seem to interfere with the server connections and authentication needed for eM Client to work
I’m not using an antivirus.