Huschediosch96 Can you add and sync your Bluewin Calendar with the Outlook 2019 application on a Windows laptop?
Gaeilgeoir @Huschediosch96 As stated in the link from the German-speaking Community, this function is unfortunately not included, so it does not work for the Bluewin mail calender. https://community.swisscom.ch/t5/Archiv-E-Mail-Apps/bluewin-kalender-nicht-in-outlook-%C3%BCbertragen/td-p/582664#:~:text=Wie%20gesagt%2C%20eine%20Kalender%2DSynchronisation,ein%20Konto%20bei%20Outlook.com. or here: https://community.swisscom.ch/t5/Archiv-E-Mail-Apps/Bluewin-Kalender-mit-Android-synchronisieren/m-p/562249 Where it is written you can’t sync the Bluewin Kalender with anything, no Outlook, no Android, no Thunderbird, etc.
DomiP Two of the best calendars for mobile sync are Google-Calendar (Android) and iCloud Calendar (iOS). Both are integrated directly in their Operating System and also useable over a browser.