crpb
Nevermind...
Setting Full Permissions and Delegate works for automatically open the Mailboxes in Outlook (not in Grommunio-Web). Only Delegate will not open the Mailbox. I think i need to set Permissions(for now not looking into that).
Sending an Mail from that Account only works with Delegation.
I want to be able to send E-Mails from an 'Full-Permission' Account without the From MyName in name of Delegated Mailbox.
Same behavior in Outlook and Grommunio-Web.
So i would like the behavior of Auto-Open the Mailbox and the Permission to send from Mailbox-Name when i only set 'Full-Permission'-Rights on that Mailbox.
If i remember correctly that would be the same behavior as in Exchange.

EDIT: Does it take just a while for the Server after setting the Permissions?
Now it works with auto-open of the Mailboxes(only Full Permission) or is this remembered at the server-side? I deleted my Outlook profile to test it. Will do further tests.
EDIT..:
Ok it just took a bit. So only the 'Sending Permission' is still a problem.
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Diagnoseinformationen für Administratoren:
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Der Fehler lautet [0x80070005-0x80070005-0x00000508].ROPs-Zusammenfassung:
0: ropSetProps (10) verarbeitet (1) abgeschlossen (0)
ROP-Ergebnis: 0
Antwortcodes: 0
1: ropSetProps (10) verarbeitet (1) abgeschlossen (0)
ROP-Ergebnis: 0
Antwortcodes: 0
2: ropFlushRecipients (14) verarbeitet (1) abgeschlossen (0)
ROP-Ergebnis: 0
Antwortcodes: 0
3: ropSetProps (10) verarbeitet (1) abgeschlossen (0)
ROP-Ergebnis: 0
Antwortcodes: 0
4: ropTransportSend (74) verarbeitet (1) abgeschlossen (0)
ROP-Ergebnis: 0
Antwortcodes: -2147024891
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