URL: https://it.desy.de/services/e_mail/mail_clients/zimbra/index_eng.html
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Zimbra

The Zimbra Webclient can be reached at the following address:
At Login, we recommend to use "Version: Advanced (Ajax)". That should be the default setting.
If you use a mobile device, the "Mobile" Version should be selected automatically.
Here Namespace & Groupenadministrator will find an overview of advanced configurations and information on various mail programs.