Daran hab ich mir auch schon die Zähne ausgebissen man muss alles einzeln Freischalten, dass geht nicht im gesammten.
set-casmailbox -identity "DOMAIN\USER" -OWAChangePasswordEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAPremiumClientEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWACalendarEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAContactsEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWATasksEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAJournalEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWANotesEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWARemindersAndNotificationsEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWASpellCheckerEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWASearchFoldersEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWASignaturesEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAThemeSelectionEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAJunkEmailEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAWSSAccessOnPublicComputersEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAWSSAccessOnPrivateComputersEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAUNCAccessOnPublicComputersEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAUNCAccessOnPrivateComputersEnabled:$true
set-casmailbox -identity "DOMAIN\USER" -OWAAllAddressListsEnabled:$true