URL: https://it.desy.de/services/e_mail/mail_programs_advanced_configurations_informations/outlook/use_own_filters_on_existing_folders/index_eng.html
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Use own filters on existing folders
If you generate your filters with Outlook, the filters will be active for all incoming e-mails. If you want to trigger older e-mails you have to use the Web interface. You can do this via Perferences -> Filters -> Choose Filter -> Run Filter -> Choose the corresponding folder -> Confirm with OK.